revision preference src: Ultimately discounting brain surgery as carrying too much risk. Physicians and neurologists such as William Mayo, Thierry de Martel, Richard Brickner, and Leo Davidoff had, before 1935, entertained the proposition. <SEP> tgt: Although ultimately discounting brain surgery as carrying too much risk, physicians and neurologists such as William Mayo, Thierry de Martel, Richard Brickner, and Leo Davidoff had, before 1935, entertained the proposition.