[1] Govt Catalonia, Minist Hlth, Directorate Gen Hlth Planning & Res, Barcelona, Spain
[2] Univ Pompeu Fabra, Dept Expt & Hlth Sci, Barcelona, Spain
[3] CRIA IUL, Ctr Rede Invest Antropol, Ctr Res Anthropol, Lisbon, Portugal
[4] Univ W England, Dept Hlth & Social Sci, Bristol BS16 1QY, Avon, England
[5] Vrije Univ Brussel, Univ Hosp Brussels, Nursing & Midwifery Res Unit, Brussels, Belgium
[6] Univ Liverpool, Dept Hlth Serv Res, Liverpool L69 3BX, Merseyside, England
[7] Univ Seville, Fac Enfermeria Fisioterapia & Podol, Dept Enfermeria, Seville, Spain
[8] Zurich Univ Appl Sci, Sch Hlth Profess, Inst Midwifery, Zurich, Switzerland
[9] Spital STS AG, Womens Clin, Thun, Switzerland
[10] Univ Ulster, Maternal Fetal & Infant Res Ctr, Coleraine BT52 1SA, Londonderry, North Ireland
[11] Bournemouth Univ, Ctr Midwifery Maternal & Perinatal Hlth, Bournemouth, Dorset, England