Juha V Taavela1, Alina Popp1,2, Kalle A Kurppa1, Markku J Mäki1. 1. Tampere Centre for Child Health Research, University of Tampere and Tampere University Hospital, Tampere, Finland. 2. University of Medicine and Pharmacy "Carol Davila" and Institute for Mother and Child Care, Bucharest, Romania.