title: On the determination of sample size.
authors.affiliation: Biostatistics Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709-2233, USA. umbach@niehs.nih.gov
authors.forename: David M
authors.initials: DM
authors.lastname: Umbach
mesh_terms: D004777:Environment; D020022:Genetic Predisposition to Disease; D006801:Humans; D012307:Risk Factors; D018401:Sample Size