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Using another study as a model, we used the World Health Organization's Trial Registries List Version 2.1 \cite{25348628}.  Registries met specific criteria for quality, validity, content, accessibility, unambiguous identification, technical capacity, and administration/governance \cite{undefined}. Sources such as the Cochrane CENTRAL Registry of COntrolled Trials were not included as clinical trials registries but treated as a bibliographic database, as CENTRAL features a selection of already published trials.