Wouldn’t you want to know if your doctor was a paid spokesman for a drug company? Or held personal beliefs incompatible with the treatment you want? Right now, in many parts of the world, your doctor simply doesn’t have to tell you about that. And when physician Leana Wen asked her fellow doctors to open up, the reaction she got was unsettling. There's a code of silence amongst doctors whose attitudes and behaviour challenge conventional notions of transparency and...