Knowledge and Evaluation Research Unit, Mayo Clinic, Rochester, Minnesota, United States of America; Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota, United States of America. Knowledge and Evaluation Research Unit, Mayo Clinic, Rochester, Minnesota, United States of America. Integrative Medicine Program-Division of General Internal Medicine, Mayo Clinic, Rochester, Minnesota, United States of America. Knowledge and Evaluation Research Unit, Mayo Clinic, Rochester, Minnesota, United States of America; Mayo Graduate School, Mayo Clinic, Rochester, Minnesota, United States of America. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota, United States of America. Mayo Clinic Libraries, Mayo Clinic, Rochester, Minnesota, United States of America. Knowledge and Evaluation Research Unit, Mayo Clinic, Rochester, Minnesota, United States of America; Division of Endocrinology, Metabolism, and Nutrition, Mayo Clinic, Rochester, Minnesota, United States of America.