title: Measuring serum melatonin in epidemiologic studies.
authors.affiliation: Division of Cancer Epidemiology and Genetics, National Cancer Institute, 6120 Executive Boulevard, EPS 5024, MSC 7234, Bethesda, MD 20852-7234, USA. hsinga@mail.nih.gov
authors.forename: Ann W
authors.initials: AW
authors.lastname: Hsing
authors.forename: Tamra E
authors.initials: TE
authors.lastname: Meyer
authors.forename: Shelley
authors.initials: S
authors.lastname: Niwa
authors.forename: Sabah M
authors.initials: SM
authors.lastname: Quraishi
authors.forename: Lisa W
authors.initials: LW
authors.lastname: Chu