Authors’ contributions
MU was chief investigator of the CHESS study. DRE, SJCT, FG and MU were involved in conception and design of the process evaluation. VN collected and managed the data overseen by DRE, FG and SJCT. VN and DRE were responsible for data analysis. DRE and VN, drafted the manuscript supported by all authors. All authors contributed to interpretation of results and drafting of the final article. All authors read and approved the final manuscript.