[1] Norwegian Sch Sport Sci, N-0806 Oslo, Norway
[2] St Louis Univ, Dept Obstet Gynecol & Womens Hlth, St Louis, MO 63103 USA
[3] Univ Politecn Madrid, Fac Ciencias Actividad Fis & Deporte INEF, Madrid, Spain
[4] Univ Queensland, Sch Human Movement & Nutr Sci, Ctr Res Exercise, St Lucia, Qld, Australia
[5] Queens Univ, Dept Maternal Fetal Med, Kingston, ON, Canada
[6] King Edward VII Hosp London, Poundbury Clin Dorchester Poundbury Suite, London, England
[7] Univ N Carolina, Chapel Hill, NC USA
[8] Gillings Sch Global Publ Hlth, Dept Epidemiol, Chapel Hill, NC USA
[9] Norwegian Sch Sport Sci, Dept Sport Sci, N-0806 Oslo, Norway
[10] Swedish Sch Sport & Hlth Sci, Stockholm, Sweden
[11] Univ Lausanne, Inst Sports Sci, Fac Biol & Med, Lausanne, Switzerland
[12] Univ Tampere, Sch Hlth Sci, FIN-33101 Tampere, Finland
[13] Natl Inst Hlth & Welf, Dept Children Young People & Families, Helsinki, Finland
[14] Univ Western Ontario, R Samuel McLaughlin Fdn, Exercise & Pregnancy Lab, London, ON, Canada
[15] Univ Utah, Dept Obstet & Gynecol, Salt Lake City, UT USA
[16] Graz Univ, Inst Sport Sci, Graz, Austria
[17] Oslo Univ Hosp, N-0450 Oslo, Norway
[18] Univ British Columbia, Dept Family Practice, Vancouver, BC V5Z 1M9, Canada
[19] Univ British Columbia, Ctr Hip Hlth & Mobil, Vancouver, BC V5Z 1M9, Canada