Ietje Perfors

53 Results Study selection As shown in Figure 1, 7,627 records were eligible for inclusion after removal of duplicates. Title and abstract screening yielded 97 articles. Of these, 90 were excluded after full-text screening. Main reasons for exclusion were (1) insufficient involvement of the GP, (2) GP involvement started after completion of primary cancer treatment, or (3) no RCT, CCT, controlled before and after study or interrupted time series design was used. Figure 1 . Flow diagram for selection of studies, based on Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). 15 Abbreviations: GP: General practitioner. 3