Study Characteristics According to Categories of Low value
Practices
Most studies were based on case series
(n=33)22,31,33,34,36,38,41,43-50,56,57,60-64,66,68-72,74,75,7785,89,90followed by systematic reviews with or without meta-analysis
(n=12)23-25,28,29,39,53,59,67,78,83,86,88,91,
prospective cohorts (n=9)30,32,35,37,42,51,54,79,87,
RCTs (n= 9)27,55,65,73,80-82,84 and retrospective
cohorts (n=2; Supplemental Digital File 6).52,58