This column is one of a series published periodically in EXPLORE on recent Cochrane systematic reviews. Cochrane is an international non-profit organization that prepares systematic reviews of randomized controlled trials of a wide range of interventions. The Cochrane Complementary Medicine Field, which coordinates this column, is a group within Cochrane that is dedicated to facilitating the production and dissemination of Cochrane systematic reviews focused on complementary, alternative, and integrative medicine interventions. For additional information on Cochrane and the Cochrane Complementary Medicine Field please contact L. Susan Wieland, PhD at [email protected].