Missingness mechanisms and generalizability of patient reported outcome measures in colorectal cancer survivors – assessing the reasonableness of the 'missing completely at random' assumption: assessing the reasonableness of the “missing completely at random” assumption - Johanne Dam Lyhne; Allan ‘Ben’ Smith; Lars Henrik Jensen; Torben Frøstrup Hansen; Lisbeth Frostholm; Signe Timm (BMC Medical Research Methodology, 2024)