Article History
Received: 27 August 2020
Accepted: 18 November 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The 4-valent HPV vaccine, Gardasil® [Human Papillomavirus (Types 6, 11, 16,18) Recombinant Vaccine] and 9-valent HPV vaccine, Silgard9® [Human Papillomavirus (HPV 6, 11, 16, 18, 31, 33, 45, 52, and 58)] were developed and are currently marketed by Merck & Co., Inc., Kenilworth, NJ, USA. CP and EE are employees of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA. TK and AM are employees of MSD K.K., Tokyo, Japan.