1. Zaans Medisch Centrum; Department of Pediatrics; Koningin Julianaplein 58 Amsterdam Netherlands 1500 EE Zaandam
2. Wilhelmina Children's Hospital, University Medical Center Utrecht; Department of Pediatric Infectious Diseases; PO Box 85090 Utrecht Netherlands 3508 AB
3. Emma Children's Hospital / Academic Medical Centre; Pediatrics; P.O box 22660 Amsterdam Netherlands 1100DD
4. Emma Children's Hospital, Academic Medical Centre; Department of Pediatrics; Meibergdreef 9 Amsterdam Netherlands 1105 AZ