Epstein 2017.

Methods	Study design: randomized trial Unit of allocation: provider Unit of analysis: patient Power calculation: done
Participants	Care setting: ambulatory care, specialized care, USA Health professionals: 38; specialists; fully trained; male and female Patients: 265; non hematologic cancer; male and female
Interventions	Multifaced intervention Patient MI + educational meeting Quote: "(1) a 2‐session in‐office physician training (1.75 hours) using a brief video, feedback from standardized patients portraying roles of patients with advanced cancer, audio recorded study patient visits, and (2) a single 1‐hour patient and caregiver coaching session incorporating a question prompt list to help patients bring their most important concerns to their oncologist’s attention at an upcoming office visit, plus up to 3 follow‐up phone calls (Table 1; eTable 2 in Supplement 3). Trainers and coaches underwent 3‐day on‐site training. To promote patient centered communication about disease course, prognosis, treatment decisions and end‐of‐life care, physician and patient interventions focused on the same 4 key domains of patient centered communication." page 94 Usual care Quote from the abstract : "Control participants received no training."
Outcomes	Health Care Climate Questionnaire (HCCQ) (continuous)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information to make a judgement
Allocation concealment (selection bias)	Low risk	Quote: "Only the study statisticians were aware of the random number sequences and treatment assignment, preserving blinding among transcriptionists, coders, and abstractors." Page 95
Blinding (performance bias and detection bias) Participant‐reported outcome	Unclear risk	Comment: insufficient information to permit judgement.
Incomplete outcome data (attrition bias) Participant‐reported outcome	Unclear risk	Comment: missing outcome data were not specified.
Selective reporting (reporting bias)	High risk	Comment: some relevant outcomes prespecified in the study protocol were not reported in the results: preferred role and actual role in decision making, PEACE (NCT01485627).
Other bias	Low risk
Baseline measurement? Participant‐reported outcome	Unclear risk	Comment: insufficient information to permit judgement.
Protection against contamination?	Unclear risk	Comment: professionals were allocated within a clinic or practice and it is possible that communication between intervention and control professionals could have occurred.
Baseline characteristics patients	Low risk	Comment: see Table 1: no statistically significant differences between intervention and control for pre‐randomization or cluster‐RCT
Baseline characteristics healthcare professionals	Low risk	COmment: eTable 1: no statistically significant differences between intervention and control for pre‐randomization or cluster‐RCT