1.
Effectiveness of diclofenac versus acetaminophen in primary care patients with knee osteoarthritis: [NTR1485], DIPA-Trial: Design of a randomized clinical trial
Prevalence and pattern of radiographic hand osteoarthritis and association with pain and disability (the Rotterdam study)
The effect of Tai Chi Chuan in reducing falls among elderly people: design of a randomized clinical trial in the Netherlands [ISRCTN98840266].
Prognosis of trochanteric pain in primary care