“…[a surgeon] is not negligent merely because his conclusion differs from that of other professional men, nor because he has displayed less skill or knowledge than others would have shown. The true test…is whether he has been proved to be guilty of such failure as no doctor of ordinary skill would be guilty of if acting with ordinary care.”
“…[a surgeon] is not guilty of negligence if he has acted in accordance with a practice accepted as proper by a responsible body of medical men skilled in that particular art…a man is not negligent, if he is acting in accordance with such a practice, merely because there is a body of opinion who would take a contrary view.”