“The judge determines what is legal and who is guilty. The priest declares what is holy and who has broken a taboo. The physician decides what is a symptom and who is sick. He is a moral entrepreneur, charged with inquisitorial powers to discover certain wrongs to be righted. Medicine, like all crusades, creates a new group of outsiders each time it makes a new diagnosis stick. Morality is as implicit in sickness as it is in crime or in sin.”