title: Design and analysis of clinical trials of nutrients: author reply.
authors.affiliation: Creighton University, Omaha, Nebraska, USA.
authors.forename: Robert P
authors.initials: RP
authors.lastname: Heaney
mesh_terms: D002985:Clinical Protocols / Q000592:standards*; D017408:Guidelines as Topic; D006801:Humans; D012107:Research Design