Authors’ contributions
PD, MR
CA and SB had the idea for the study and obtained funding for the study. CA, SB, MR, CB, CF and MVM developed the research design and methods with advice from KS. PD, MR and CA developed the data protection concept and finalized the study protocol. MR, VB and PD developed the study materials with input from CF and MVM. CF, MVM and KP collected clinical data. PD, CH, CB and KP managed and analysed data. CB, MR, VB and KP took field notes. PD wrote the article with input from CH, SB, CF, VB, PS, CB, CA, KS and MVM. All authors reviewed the article for important intellectual content.