DR. WAYNE SHREFFLER M.D., PH.D., is a pediatrician at Massachusetts General Hospital in Boston. He's done research in the field of allergic diseases at both NIH and American Academy of Allergy, Asthma & Immunology. DR. QIAN YUAN M.D., PH.D.,originally from Bejing China, is Pediatrician, specializing in Pediatric Gastroenterology and Nutrition at Massachusetts General Hospital in Boston, Massachusetts. He also received his PhD at the Auckland Medical Research Foundation. KAREN ASP is a freelance writer and contributing editor for Women's Day magazine. She is also a health, fitness and other topics for Better Homes and Gardens, Glamour, Good Housekeeping, MSNBC.com, Martha Stewart Living, Men's Fitness, O Magazine, Prevention, Real Simple, Runner's World, Self, Shape, Women's Health and other publications.