When Dr. Sanjay Gupta travels the world for CNN to report on natural disasters, conflicts, and catastrophes, he illuminates the stories of the affected and the afflicted. But a few times in his career, while reporting abroad, he's been asked to don his surgeon's cap and gloves to intervene in high-stakes medical emergencies. Far from his controlled and highly regulated operating rooms, Gupta found himself trying to save lives in the most makeshift...