1. Industrial Design Department, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands
2. Neonatal Intensive Care Unit, Department of Pediatrics, Máxima Medical Center, Veldhoven, The Netherlands
3. Clinical Child and Family Studies Department & EMGO Institute for Health and Care Research, VU University Amsterdam, The Netherlands. E-mails: k.frederiks@student.tue.nl, m.j.g.croes@tue.nl, w.chen@tue.nl, S.BambangOetomo@mmc.nl, p.s.sterkenburg@vu.nl