pWelcome to the b21st Edition bofb Nelson Textbook of Pediatricsb - the reference of choice among pediatricians, pediatric residents, and others involved in the care of young patients. This fully revised edition continues to provide the breadth and depth of knowledge you expect from iNelsoni, while also keeping you up to date with bnew advances in the science and art of pediatric practiceb. Authoritative and reader-friendly, it delivers the information you need in a bconcise, easy-to-use format for everyday reference and study.b From rapidly changing diagnostic and treatment protocols to new technologies to the wide range of biologic, psychologic, and social problems faced by children today, this comprehensive 2-volume reference bkeeps you on the cutting edge of the very best in pediatric carebi.piulliIncludes bmore than 70 new chaptersb, including Postural Orthostatic Tachycardia Syndrome POTS, Rare and Undiagnosed Diseases, Approach to Mitochondrial Disorders, Electronic Nicotine Del