Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Results of the Risk of Bias Assessment (RoB 2). Note. References of included studies are provided in Table 2. Numbers in parentheses refer to different samples of the respective studies (see Table 2 for details). TLMA = three-level meta-analysis; + = low risk; ! = some concerns; - = high risk; D1 = randomization process; D2 = deviations from intended interventions; D3 = missing outcome data; D4 = measurement of the outcome; D5 = selection of reported result.
