“…Of these, three non-hierarchical categories were identified based on the method of RTW data collection: 1) regional/national databases (14, 27, 31); 2) patient reported questionnaires or telephone interviews (15–17, 22, 25, 29, 37, 40, 42, 48–50, 52, 60, 68); and 3) medical records. For the latter, RTW information was either recorded during clinical assessment (18, 20, 30, 35, 39, 44, 47, 51, 53, 63, 69) or was extracted retrospectively from the records (24, 38, 54, 56–58, 65).…”