Barbara Piškur*, Anna JHM Beurskens, Marian J Jongmans, Marjolijn Ketelaar, Meghan Norton, Christina A Frings, Helena Hemmingsson and Rob JEM Smeets
* Corresponding author: Barbara Piškur barbara.piskur@zuyd.nl
BMC Pediatrics 2012, 12:177 doi:10.1186/1471-2431-12-177