A doctor who is also a long-term patient examines the body, in sickness and in health. Jamie Weisman was a patient long before she was a doctor. She was born with a rare defect in her immune system that leaves her prey to a range of ailments and crises and that, because it is treatable but not curable, will keep her a patient for life. Her history has graced her with a deeper perspective -- a second sight, in a sense -- on the body itself, in all...