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    Athlete in oxygen mask riding exercise bike with measuring of oxygen consumption. — Stock Photo
    Athlete in oxygen mask riding exercise bike with measuring of oxygen consumption.
    Content mother putting on oxygen mask on face of son for inhalation procedure while sitting on sofa at home — Stock Photo
    Content mother putting on oxygen mask on face of son for inhalation procedure while sitting on sofa at home
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    Colored scanning electron micrograph of red blood cells. — Stock Photo
    Colored scanning electron micrograph of red blood cells.
    Side view of content sick boy using respirator and breathing oxygen from inhaler while sitting on sofa at home — Stock Photo
    Side view of content sick boy using respirator and breathing oxygen from inhaler while sitting on sofa at home
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Red blood cells — Stock Photo
    Red blood cells
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Side view of Caucasian male patient sleeping in bed in the ward at hospital. In the background senior mixed-race male patient lying in bed. — Stock Photo
    Side view of Caucasian male patient sleeping in bed in the ward at hospital. In the background senior mixed-race male patient lying in bed.
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet — Stock Photo
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Oxygen mask and tube on white background. — Stock Photo
    Oxygen mask and tube on white background.
    Side view unrecognizable person wearing silver costume with breathing apparatus and hose attached to potted plant standing in shabby abandoned room — Stock Photo
    Side view unrecognizable person wearing silver costume with breathing apparatus and hose attached to potted plant standing in shabby abandoned room
    Close up of mixed race female doctor giving medicine to mature mixed-race female patient in the ward at hospital — Stock Photo
    Close up of mixed race female doctor giving medicine to mature mixed-race female patient in the ward at hospital
    Leaf epidermis, light micrograph. Leaf epidermis has small pores, called stomata, which open up for photosynthetic gas exchange and transpiration. — Stock Photo
    Leaf epidermis, light micrograph. Leaf epidermis has small pores, called stomata, which open up for photosynthetic gas exchange and transpiration.
    Side view of little boy with asthma using inhaler while sitting on sofa at home — Stock Photo
    Side view of little boy with asthma using inhaler while sitting on sofa at home
    Using pulse oximeter at home to test oxygen level in blood. — Stock Photo
    Using pulse oximeter at home to test oxygen level in blood.
    Man picks edible mushrooms in the forest — Stock Photo
    Man picks edible mushrooms in the forest
    Oxygen pressure gauge on cylinder of medical oxygen. — Stock Photo
    Oxygen pressure gauge on cylinder of medical oxygen.
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Team of surgeons performing operation in operation theater at hospital — Stock Photo
    Team of surgeons performing operation in operation theater at hospital
    Boy in oxygen mask using nebulizer during inhalation while sitting on sofa and reading book — Stock Photo
    Boy in oxygen mask using nebulizer during inhalation while sitting on sofa and reading book
    Team of doctors giving oxygen to patient in intensive care unit — Stock Photo
    Team of doctors giving oxygen to patient in intensive care unit
    3d illustration of red blood cells erythrocytes, white blood cells leukocytes and platelets thrombocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes, white blood cells leukocytes and platelets thrombocytes.
    African american senior woman sitting on wheelchair with oxygen mask at home. healthcare and lifestyle during covid 19 pandemic. — Stock Photo
    African american senior woman sitting on wheelchair with oxygen mask at home. healthcare and lifestyle during covid 19 pandemic.
    Group of surgeons performing operation in operation theater of hospital — Stock Photo
    Group of surgeons performing operation in operation theater of hospital
    Top view of crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic — Stock Photo
    Top view of crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic
    Crop unrecognizable woman using modern pulse oximeter on finger of kid for measuring oxygen level in blood — Stock Photo
    Crop unrecognizable woman using modern pulse oximeter on finger of kid for measuring oxygen level in blood
    Landscape in the Simien Mountains National Park. View from peak Imet Gogo over the highlands, the escarpment and the lowlands of the National Park with the endemic Giant Lobelia Lobelia rhynchopetalum. Imet Gogo is the best known viewpoint in the Pa — Stock Photo
    Landscape in the Simien Mountains National Park. View from peak Imet Gogo over the highlands, the escarpment and the lowlands of the National Park with the endemic Giant Lobelia Lobelia rhynchopetalum. Imet Gogo is the best known viewpoint in the Pa
    Side view of diverse male patients interacting with each other while relaxing on the bed in the ward at hospital. — Stock Photo
    Side view of diverse male patients interacting with each other while relaxing on the bed in the ward at hospital.
    Female doctor wearing mask anesthetizing mid adult man in hospital ward — Stock Photo
    Female doctor wearing mask anesthetizing mid adult man in hospital ward
    Crop unrecognizable loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home — Stock Photo
    Crop unrecognizable loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home
    Man talking on mobile phone and paramedics examining injured boy on street in background — Stock Photo
    Man talking on mobile phone and paramedics examining injured boy on street in background
    Doctor and paramedics examining a patient in emergency room at hospital — Stock Photo
    Doctor and paramedics examining a patient in emergency room at hospital
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras — Stock Photo
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras
    Back view of anonymous sportspeople silhouettes with diving equipment and photo camera swimming under sea water with bubbles — Stock Photo
    Back view of anonymous sportspeople silhouettes with diving equipment and photo camera swimming under sea water with bubbles
    Doctor and paramedics examining a patient in emergency room at hospital — Stock Photo
    Doctor and paramedics examining a patient in emergency room at hospital
    Doctor putting oxygen mask on patient in hospital — Stock Photo
    Doctor putting oxygen mask on patient in hospital
    Hand of a doctor giving oxygen to a pregnant woman in operating room — Stock Photo
    Hand of a doctor giving oxygen to a pregnant woman in operating room
    Female nurse holding oxygen mask over male patient's mouth in intensive care unit — Stock Photo
    Female nurse holding oxygen mask over male patient's mouth in intensive care unit
    Front view of mixed race female doctor in hijab consoling mature mixed race female patient in the ward at hospital. — Stock Photo
    Front view of mixed race female doctor in hijab consoling mature mixed race female patient in the ward at hospital.
    Loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home — Stock Photo
    Loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Over the shoulder view of mixed race female doctor in hijab consoling beautiful mixed-race female patient in the ward at hospital. They are holding hands. — Stock Photo
    Over the shoulder view of mixed race female doctor in hijab consoling beautiful mixed-race female patient in the ward at hospital. They are holding hands.
    Doctor, nurse and paramedics examining patient on stretcher — Stock Photo
    Doctor, nurse and paramedics examining patient on stretcher
    Blood oxygen monitor on finger of patient in intensive care ward, close-up. — Stock Photo
    Blood oxygen monitor on finger of patient in intensive care ward, close-up.
    Doctor hand putting oxygen mask on patient in hospital — Stock Photo
    Doctor hand putting oxygen mask on patient in hospital
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Paramedics examining patient in ambulance — Stock Photo
    Paramedics examining patient in ambulance
    Red blood cells — Stock Photo
    Red blood cells
    Close up of rapids in a mountain river with long exposure effect — Stock Photo
    Close up of rapids in a mountain river with long exposure effect
    Construction of plastic tubes and tools for treating animals in operating room of veterinary clinic — Stock Photo
    Construction of plastic tubes and tools for treating animals in operating room of veterinary clinic
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet — Stock Photo
    Sick boy in oxygen mask sitting on sofa at home and playing video game on tablet
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Nurse consoling senior patient with doctor in hospital — Stock Photo
    Nurse consoling senior patient with doctor in hospital
    Anesthesiologist holding oxygen mask over patients face in operating room — Stock Photo
    Anesthesiologist holding oxygen mask over patients face in operating room
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Scuba diver underwater under sun beams — Stock Photo
    Scuba diver underwater under sun beams
    Front view of beautiful thoughtful mixed race female patient lying on bed in the ward while looking outside in hospital. Pulse oximetry is measuring measuring the oxygen levels in her blood. — Stock Photo
    Front view of beautiful thoughtful mixed race female patient lying on bed in the ward while looking outside in hospital. Pulse oximetry is measuring measuring the oxygen levels in her blood.