Status of participants and their outcome data at both the trial and systematic review levels.

<p> † It is possible that the investigators collected but did not report the data. * Data analysis might have included assumptions about missing participant data. ITT = intention to treat; CCA = complete case analysis. § Refers to ineligible participants mistakenly randomized and meeting the conditions for appropriate exclusion (see text), and to participants with other reasons for appropriate exclusion (e.g., subsequently found not to have condition of interest, or never underwent a procedure for which the intervention is intended).