Table 5. Characteristics of the included study protocols (continued).

First author (year), country	measurement points	recruitment, HCP	sample-size calculation (ICC)
den Ouden et al., (2015), Netherlands	T0 = pre-intervention T1 = 12 months follow-up T2 = 24 months follow-up	79 general practices (GPs)	N = 73 per group, p = 80%, α 0.05, CI = 95% —> ICC [1 (m-1)r] r = 0.025
Drewelow et al., (2012), Germany	T0 = pre-intervention, T1 = 6 months follow-up, T2 = 12 months follow-up, T3 = 18 months follow-up, T4 = 24 months follow-up	20 GPs per study centre (13 patients/ practice)	54 GPs with 13 patients, N = 780 patients (derived factor 1.9, ICC 0.1, average cluster size of 10; p = 80%)
Geiger et al., (2011), Germany	T0 = pre-intervention, T1 = IG: intermediate, CG: waiting assessment, T2 = IG: post-intervention, CG: intermediate assessment, T3 = IG: 6 months follow-up CG: post-intervention	7 university outpatient clinics, oncologists, gynaecologists, psychiatrists, neurologists, dentists, radiologists	N = 76 patients, (α 0.05, p = .85), N = 36 physicians (α 0.05, p = .85) —> no ICC reported
Goss et al., (2015), Italy	T1 = directly after consultation (SDM-Q-9 not at baseline)	3 oncology depart-ments, oncologists	N = 260 patients, 130 per group (p = 80%, α 0.05) —> no ICC reported
Löffler et al., (2014), Germany	T0 = pre-intervention, (admission to hospital), T1 = discharge from hospital, T2 = 6 months follow-up, T3 = 12 months follow-up	4 clinics (30 patients/ week& clinic), pharmacists (GPs & hospital physicians)	N = 1544 patients (p = 80%, α 0.05), IG: 772 & CG: 772 in 42 wards—> with ICC 0.1
Savelberg et al, (2015), Netherlands	T0 = pre-implementation, T1 = implementation, T2 = post-implementation	4 hospitals, breast surgeons, radiation oncologists, nurses	T0 & T1: N = 10, T2: N = 4 per hospital from implementation sample (N = 16)

GP = general practitioner, IG = intervention group, CG = control group, ICC = intracluster correlation coefficient