Physical activity and cardiovascular disease risk profile in women.
Pols MA, Peeters PH, Twisk JW, Kemper HC, and Grobbee DE
American Journal of Epidemiology. Aug 1997
(DOI : 10.1093/oxfordjournals.aje.a009273)
Validity and repeatability of a modified Baecke questionnaire on physical activity.
Pols MA, Peeters PH, Bueno-de-Mesquita HB, Ocké MC, Wentink CA, Kemper HC, and Collette HJ
International Journal of Epidemiology. Apr 1995
(DOI : 10.1093/ije/24.2.381)