Strengths and limitations
RECRUITMENT
The strength of this study is that we opted for cluster randomization, in order to keep the effect of the intervention as pure as possible to prevent a contamination effect. The following limitations of the present study need to be taken into account. First, we only included 160 participants while the desired number of participants was 248. Since the number of interested patients was lower than expected in the first recruitment strategy, we added the second and third recruitment strategy and extended the inclusion period with another six months, but we still did not achieve our sample size needed. This may raise questions regarding the validity of our results. However, absence of evidence is not evidence of absence [