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    Young woman with resuscitation mask and male hand. — Stock Photo
    Young woman with resuscitation mask and male hand.
    Surgeons performing operation in operation theater of hospital — Stock Photo
    Surgeons performing operation in operation theater of hospital
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    Team of surgeons performing operation in operation theater at hospital — Stock Photo
    Team of surgeons performing operation in operation theater at hospital
    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
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Doctor comforting pregnant woman during labor at hospital — Stock Photo
    Doctor comforting pregnant woman during labor at hospital
    3d illustration of red blood cells erythrocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes.
    Team of surgeons performing operation in operation theater at hospital — Stock Photo
    Team of surgeons performing operation in operation theater at hospital
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    White engine of aircraft in azure heaven — Stock Photo
    White engine of aircraft in azure heaven
    Front view of Caucasian male patient sleeping in bed in the ward at hospital — Stock Photo
    Front view of Caucasian male patient sleeping in bed in the ward at hospital
    High angle view of beautiful mixed-race female patient using digital tablet in the ward at hospital. — Stock Photo
    High angle view of beautiful mixed-race female patient using digital tablet in the ward at hospital.
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Doctor and paramedics examining a patient in emergency room at hospital — Stock Photo
    Doctor and paramedics examining a patient in emergency room at 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
    Cardiovascular system transporting nutrients and oxygen — Stock Photo
    Cardiovascular system transporting nutrients and oxygen
    Elementary age asthmatic girl wearing oxygen face mask. — Stock Photo
    Elementary age asthmatic girl wearing oxygen face mask.
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Pilot in mask operating airplane during flight — Stock Photo
    Pilot in mask operating airplane during flight
    Scuba diver swimming under water with cute turtle — Stock Photo
    Scuba diver swimming under water with cute turtle
    Team of doctors putting oxygen mask on patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on patient face in the hospital
    Side view of beautiful mixed-race female doctor consoling mixed-race female patient in the ward. Mixed-race female patient is lying in bed at the ward. — Stock Photo
    Side view of beautiful mixed-race female doctor consoling mixed-race female patient in the ward. Mixed-race female patient is lying in bed at the ward.
    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
    Astrocyte glial nerve cell, digital illustration. — Stock Photo
    Astrocyte glial nerve cell, digital illustration.
    Nurse putting oxygen mask on patient in hospital — Stock Photo
    Nurse putting oxygen mask on patient in hospital
    From above of crop unrecognizable vet with colleague putting oxygen mask on muzzle of cat while preparing for surgery — Stock Photo
    From above of crop unrecognizable vet with colleague putting oxygen mask on muzzle of cat while preparing for surgery
    Doctor and paramedics examining a patient in emergency room at hospital — Stock Photo
    Doctor and paramedics examining a patient in emergency room at hospital
    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
    From above content sick boy using respirator and breathing oxygen from inhaler while lying down on sofa at home — Stock Photo
    From above content sick boy using respirator and breathing oxygen from inhaler while lying down on sofa at home
    Front view of diverse female doctors interacting with mature mixed-race female patient in the ward at hospital. Female patient is looking relieved. — Stock Photo
    Front view of diverse female doctors interacting with mature mixed-race female patient in the ward at hospital. Female patient is looking relieved.
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Little kid using inhaler in clinic during check up — Stock Photo
    Little kid using inhaler in clinic during check up
    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
    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.
    Anesthetist holding oxygen mask over patient mouth in operating room — Stock Photo
    Anesthetist holding oxygen mask over patient mouth in operating room
    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
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    3d illustration of red blood cells erythrocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes.
    Side view of beautiful mixed-race female nurse in hijab interacting with mixed-race female patient in the ward at hospital. Nurse has stethoscope around her neck. — Stock Photo
    Side view of beautiful mixed-race female nurse in hijab interacting with mixed-race female patient in the ward at hospital. Nurse has stethoscope around her neck.
    Blood oxygen monitor on finger of patient in intensive care ward. — Stock Photo
    Blood oxygen monitor on finger of patient in intensive care ward.
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Portrait of beautiful young mixed race female patient lying on bed with hands on stomach in the ward in hospital. Pulse oximetry is measuring the oxygen level in her blood. — Stock Photo
    Portrait of beautiful young mixed race female patient lying on bed with hands on stomach in the ward in hospital. Pulse oximetry is measuring the oxygen level in her blood.
    Red blood cells — Stock Photo
    Red blood cells
    Doctor hand putting oxygen mask on patient in hospital — Stock Photo
    Doctor hand putting oxygen mask on patient in hospital
    From above of crop medical specialist using pulse oximeter sensor while examining kid in hospital — Stock Photo
    From above of crop medical specialist using pulse oximeter sensor while examining kid in hospital
    Surgeons performing operation in operation theater of hospital — Stock Photo
    Surgeons performing operation in operation theater of hospital
    Young boy with asthma problems making inhalation with mask on his face.( — Stock Photo
    Young boy with asthma problems making inhalation with mask on his face.(
    Surgeon holding oxygen mask in operation room at hospital — Stock Photo
    Surgeon holding oxygen mask in operation room at hospital
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake — Stock Photo
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake
    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
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells — Stock Photo
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells
    Doctor and nurse pushing senior patient on stretcher in hospital corridor — Stock Photo
    Doctor and nurse pushing senior patient on stretcher in hospital corridor
    Close up of thoughtful mixed race female patient relaxing in bed in the ward at hospital — Stock Photo
    Close up of thoughtful mixed race female patient relaxing in bed in the ward at hospital
    Team of doctors putting oxygen mask on a male senior patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on a male senior patient face in the hospital
    Red blood cells aggregated — Stock Photo
    Red blood cells aggregated
    Crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic while using laptop — Stock Photo
    Crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic while using laptop
    Paramedic giving oxygen to injured girl at accident spot — Stock Photo
    Paramedic giving oxygen to injured girl at accident spot
    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
    Chicken eggshell cross section — Stock Photo
    Chicken eggshell cross section