2.2. Search Strategy
PubMed, EMBASE, Cochrane library, and WOS were used to conduct a systematic review of the published literature and searched up until December 31st, 2020 (from January 1st, 1900). The search terms were (Papilloma* or Papilloma Virus or Papillomatosis or Papillomatoses) and (Laryngeal* or throat or larynx or throttle) and (CO2laser* or KTP laser* or potassium titanyl phosphate laser) (Search Strategy for PubMed, Appendix S2). Reference lists of previously published reviews and studies in these reviews were researched in this work to make sure all the related studies were involved.