Independent screening of titles and abstracts was performed by independent reviewers (P.D., S.S., J.F.) to identify potential studies for inclusion. A second reviewer (O.A.) subsequently reviewed the full-text articles and identified articles for inclusion. Any disagreements about inclusion were resolved through discussion. We incorporated any studies (prospective or retrospective) that reported on patient characteristics and symptoms of interest. For studies published in Chinese, we used Google translate to assess for potential inclusion and for data extraction.