1. Instituto Politécnico de Lisboa H&TRC- Centro de Investigação em Saúde e Tecnologia, ESTeSL- Escola Superior de Tecnologia da Saúde, ,Lisboa, Portugal
2. Univ. Lisboa, Fac. Motricidade Humana,CIPER , LBMF, Lisboa P-1499-002 , Portugal
3. Department of Global Public Health and Primary Care, University of Bergen , Bergen, Norway
4. Department of Sports Medicine, Norwegian School of Sports Sciences , Oslo, Norway
5. Akershus University Hospital Department of Obstetrics and Gynecology, , Lørenskog, Norway