[1] Hanoi Med Univ, Inst Prevent Med & Publ Hlth, Hanoi, Vietnam
[2] Univ Copenhagen, Dept Anthropol, Copenhagen K, Denmark
[3] Odense Univ Hosp, Dept Obstet & Gynecol, Odense C, Denmark
[4] Univ Southern Denmark, Dept Clin Res, Odense M, Denmark
[5] Univ Copenhagen, Fac Hlth Sci, Dept Publ Hlth, Copenhagen, Denmark