Most patients reported positively or neutrally of having served as controls in the Trials within Cohorts (TwiCs) design by Verweij, Maaike E., MD, Gal, Roxanne, PhD, Burbach, J P Maarten, MD PhD, Young-Afat, Danny A., MD PhD, van der Velden, Joanne M., MD PhD, van der Graaf, Rieke, PhD, May, Anne M., PhD, Relton, Clare, PhD, Intven, Martijn P.W., MD PhD, Verkooijen, Helena M., MD PhD

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