Doctor hammer hospital physician reflex-hammer surgery ancient botanist chocolate collector historical inventor man old plinth Sloane statue stone covid 19 Covid mask CRNA face female head headgear healthcare healthcare worker medical medical equipment nurse ODP or OT portrait PPE prevention protection sars sars cov 2 scrubs staff surgeon wearing mask woman accident antiseptic bandage bandaid Bleed bleeding clean cure dr dressings emergency fix gauze glove gloves hand heal health hurt hygenic infection injured injury medic medicine paramedic patient roll rubber septic sick sterile surgical treat treatment ward wound