1. School of Medicine Doctoral Programme; University of Tampere; Tampere Finland
2. Department of Pediatrics; Kanta-Häme Central Hospital; Hämeenlinna Finland
3. Department of Neonatology; Tampere University Hospital; Tampere Finland
4. National Institute for Health and Welfare; Helsinki Finland
5. Nordic School of Public Health; Gothenburg Sweden
6. Science Center; Pirkanmaa Hospital District; Tampere Finland
7. School of Health Sciences; University of Tampere; Tampere Finland