1. GE Bekkering, PhD, is Researcher, Dutch Institute of Allied Health Care, Amersfoort, the Netherlands, and Researcher, Institute for Research in Extramural Medicine, VU University Medical Center, Amsterdam, the Netherlands.
2. MW van Tulder, PhD, is Associate Professor, Health Technology Assessment, Institute for Research in Extramural Medicine, VU University Medical Center, and Associate Professor, Health Technology Assessment, Institute for Health Sciences, Faculty of Earth and Life Sciences, Free University, Amsterdam, the Netherlands
3. EJM Hendriks, PhD, is Physical Therapist, Health Scientist, and Epidemiologist, Dutch Institute of Allied Health Care, Amersfoort, the Netherlands; Senior Researcher, Department of Epidemiology, Maastricht University; and Co-director, Center of Evidence Based Physiotherapy (CEBP), Maastricht, the Netherlands
4. MA Koopmanschap, PhD, is Senior Health Economist, Institute for Medical Technology Assessment, Erasmus University Rotterdam, Rotterdam, the Netherlands
5. DL Knol, PhD, is Statistician, Institute for Research in Extramural Medicine, VU University Medical Center, and Statistician, Department of Clinical Epidemiology and Biostatistics, VU University Medical Center
6. LM Bouter, PhD, is Professor of Epidemiology and Scientific Director, Institute for Research in Extramural Medicine, VU University Medical Center
7. RAB Oostendorp, PhD, is Physical Therapist, Manual Therapist, and Research Director, Dutch Institute of Allied Health Care; Professor of Allied Health Care, Department of Quality of Care, Research Centre for Allied Health Care, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands; and Professor of Manual Therapy, Free University of Brussels, Faculty of Medicine and Pharmacology,