Markku PT Sumanen1,2
, Ansa Ojanlatva3,4,5
, Anna Rantala6
, Lauri H Sillanmäki7
and Kari J Mattila1,8 
1University of Tampere, Medical School, Finland
2Kangasala Health Centre, Finland
3Department of Teacher Education, Turku, Finland
4Institute of Biomedicine, Center for Reproductive and Developmental Medicine, University of Turku, Finland
5Turku City Hospital, Finland
6Tampere Health Centre, Finland
7University of Turku, Department of Public Health, Finland
8Hospital District of Pirkanmaa, Department of General Practice, Finland