Table 2.

Study types extracted

Coding	Terms (following Hartling et al. [10])
1	Randomized controlled trial (RCT)
2	Non-randomized controlled trial (NRCT)a)
3	Controlled before-after study
4	Interrupted time series (with comparison group)
5	Prospective cohort study
6	Retrospective cohort study
7	Non-concurrent cohort study
8	(Nested) case-control study
9	Cross-sectional study
10	Non-comparative study (e.g. case report or case series)
11	Before-after study
12	Interrupted time series (without comparison group)

^a)Also refers to quasi-randomized controlled trial and controlled clinical trial