title: Re: "A simple, valid step test for estimating maximal oxygen uptake in epidemiologic studies".
authors.forename: C
authors.initials: C
authors.lastname: Witkov
mesh_terms: D004812:Epidemiologic Methods; D005080:Exercise Test / Q000379:methods*; D006801:Humans; D010101:Oxygen Consumption; D010809:Physical Fitness