“…We found 29 studies on factors related to recovery of internal medical patients; 19 of these were prospective cohort studies [ 27 , 29–37 , 39 , 40 , 42 , 45 , 48–53 ], eight retrospective [ 28 , 38 , 41 , 43–47 , 50 ] and two used mixed methods, combining a cohort study with interviews or a survey [ 25 , 26 ]. The sample size varied from 100 [ 27 ] to over 60,000 [ 28 ].…”