BMC Medical Research Methodology BMC Medical Research Methodology, BioMed Central, 2020, 20 (1), pp.69. ⟨10.1186/s12874-020-00941-z⟩ BMC Medical Research Methodology, 2020, 20 (1), pp.69. ⟨10.1186/s12874-020-00941-z⟩ BMC Medical Research Methodology, Vol 20, Iss 1, Pp 1-10 (2020)