BMC Medical Research Methodology BMC Medical Research Methodology, BioMed Central, 2021, 21 (1), pp.155. ⟨10.1186/s12874-021-01299-6⟩ BMC Medical Research Methodology, 2021, 21 (1), pp.155. ⟨10.1186/s12874-021-01299-6⟩ BMC Medical Research Methodology, Vol 21, Iss 1, Pp 1-11 (2021)