MG Mullender1
, NA Blom2
, M De Kleuver3
, JM Fock4
, WMGC Hitters5
, AMC Horemans6
, CJ Kalkman7
, JEH Pruijs8
, RR Timmer9
, PJ Titarsolej10
, NC Van Haasteren11
, MJ Van Tol-de Jager12
, AJ Van Vught13
and BJ Van Royen1 
1
Dept. Orthopaedic Surgery, Vrije Universiteit Medical Center (VUmc), Research Institute MOVE, Amsterdam, The Netherlands
2
Department of Pediatric Cardiology, Leiden University Medical Center, The Netherlands
3
Dept. Orthopaedics, Sint Maartenskliniek, Nijmegen, The Netherlands
4
Dept. Neurology, University Hospital Groningen, The Netherlands
5
Revalidatiecentrum Blixembosch, Eindhoven, The Netherlands
6
Vereniging Spierziekten Nederland, Baarn, The Netherlands
7
Dept. Perioperative & Emergency Care, University Medical Centre Utrecht, The Netherlands
8
Department of Paediatric Orthopaedics, University Hospital for Children and Youth Het Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands
9
Dept Anesthesiologie, University Hospital Maastricht, The Netherlands
10
Groot Klimmendaal, Arnhem, The Netherlands
11
Revalidatiecentrum Leijpark, Tilburg, The Netherlands
12
Revalidatiecentrum de Hoogstraat en Wilhelmina Kinderziekenhuis UMC Utrecht, The Netherlands
13
Department of Paediatrics, University Hospital for Children and Youth Het Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands