title: Effectiveness of complementary and alternative medicine--call for a "black box" research agenda.
authors.forename: Stefan N
authors.initials: SN
authors.lastname: Willich
mesh_terms: D015670:Acupuncture Therapy; D000887:Anthroposophy; D002986:Clinical Trials as Topic; D000529:Complementary Therapies; D005858:Germany; D006801:Humans; D010817:Physician-Patient Relations; D011446:Prospective Studies; D012042:Registries; D012106:Research