van der Zwaard, B. C., Elders, P. J., Knol, D. L., Gorter, K. J., Peeraer, L., van der Windt, D. A., & van der Horst, H. E. (2011). Treatment of forefoot problems in older people: Study protocol for a randomised clinical trial comparing podiatric treatment to standardised shoe advice. BioMed Central.

van der Zwaard, Babette C., Petra JM Elders, Dirk L. Knol, Kees J. Gorter, Louis Peeraer, Daniëlle AWM van der Windt, a Henriëtte E. van der Horst. Treatment of Forefoot Problems in Older People: Study Protocol for a Randomised Clinical Trial Comparing Podiatric Treatment to Standardised Shoe Advice. BioMed Central, 2011.

van der Zwaard, Babette C., et al. Treatment of Forefoot Problems in Older People: Study Protocol for a Randomised Clinical Trial Comparing Podiatric Treatment to Standardised Shoe Advice. BioMed Central, 2011.