Dr. Praveer Saxena, Dr. Rahul Saxena, and Dr. Vartika Saxena, “One Virus! But Different Masks in Different Countries for Protection Against it! How to Choose? One Virus! But Different Masks in Different Countries for Protection Against it! How to Choose?”, Natl J Integr Res Med, vol. 12, no. 5, pp. 73–79, Nov. 2021.