Comment on

• Effectiveness of yearly, register based screening for chlamydia in the Netherlands: controlled trial with randomised stepped wedge implementation.

  van den Broek IV, van Bergen JE, Brouwers EE, Fennema JS, Götz HM, Hoebe CJ, Koekenbier RH, Kretzschmar M, Over EA, Schmid BV, Pars LL, van Ravesteijn SM, van der Sande MA, de Wit GA, Low N, Op de Coul EL. van den Broek IV, et al. BMJ. 2012 Jul 5;345:e4316. doi: 10.1136/bmj.e4316. BMJ. 2012. PMID: 22767614 Free PMC article. Clinical Trial.