[1] Univ Ghent, Dept Publ Hlth & Primary Care, Int Ctr Reprod Hlth ICRH, Fac Med & Hlth Sci, Ghent, Belgium
[2] Tsinghua Univ, Res Ctr Publ Hlth, Beijing, Peoples R China
[3] Univ Ghent, Fac Psychol & Educ Sci, Dept Expt Clin & Hlth Psychol, Ghent, Belgium
[4] Univ Ghent, Sect Geriatr, Dept Internal Med & Paediat, Ghent, Belgium
[5] Tsinghua Univ, Sch Social Sci, Dept Sociol, Beijing, Peoples R China
[6] Univ Iibre Bruxelles ULB, Sch Publ Hlth, Brussels, Belgium