(Note: This show originally aired back in April.) On this edition of ST on Health, we speak with Dr. H. Gilbert Welch, a professor at Dartmouth Medical School and nationally recognized expert on the effects of medical testing. His past books include the widely acclaimed "Overdiagnosed." Dr. Welch joins us to talk about his new book, "Less Medicine, More Health: 7 Assumptions That Drive Too Much Medical Care." It's a volume that offers, in the words of Kirkus Reviews, "a bright, lively discussion of the excesses of medical care to which patients often unwittingly go due to certain false assumptions.... Welch demonstrates the flaws in these assumptions. His stories involve the risks, uncertainties, and harms of cancer screenings, treatments for heart disease, drugs, medical devices, and surgical procedures. He makes an especially strong case for the risks of mass screenings for cancer -- the fear, the false alarms, the overdiagnoses, and the resulting overtreatments. Vivid images make what could be discouragingly technical quite understandable.... Welch's engaging style and touches of humor make this an easy read, and the facts he presents make a convincing case." You can learn more about this interview -- and can hear a free, on-demand mp3 "stream" of it -- at this link.