TY  - RPRT
TI  - Re: "A simple, valid step test for estimating maximal oxygen uptake in epidemiologic studies".
AU  - C Witkov
PY  - 1993
DO  - 10.1093/oxfordjournals.aje.a116698
UR  - https://pubmed.ncbi.nlm.nih.gov/8460630/
ID  - 8460630
ER  -