[1] Mid Sweden Univ, Dept Hlth Sci, SE-85170 Sundsvall, Sweden
[2] Karolinska Inst, Dept Clin Sci & Educ, Sodersjukhuset, SE-11883 Stockholm, Sweden
[3] Uppsala Univ, Dept Womens & Childrens Hlth, SE-75185 Uppsala, Sweden
[4] Karolinska Inst, Dept Womens & Childrens Hlth, SE-17177 Stockholm, Sweden