when was anesthesia invented for surgery
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when was anesthesia invented for surgery
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who invented anesthesia for surgery
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when was general anesthesia invented
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first use of anesthesia in surgery
when did they start using anesthesia
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the history of anesthesia
when was anesthesia invented for surgery, surgery before anesthesia was invented, who invented anesthesia for surgery, when was anesthesia invented and by whom, when was general anesthesia invented, when was anesthesia invented in the world, when was anesthesia introduced, when was anesthesia developed, when was anesthesia created, when was anesthesia first used, first use of anesthesia in surgery, when did they start using anesthesia, first surgery with anesthesia, the first use in anesthetic surgery, the history of anesthesia