Robin Cook is the author -- and Coma is the book -- for which the term "medical thriller" was first used. It's a spine-chilling shocker about a crime beyond imagining and the committed young medical student who brings it to light. The surgery was routine -- the kind performed many times a day at Boston's most prestigious hospital. The teams that worked in OR;t make up for what was happening around them. Several patients, admitted to the hospital for minor surgery, never awoke. For some inexplicable reason, their brains had been destroyed