Singh, S. K., Mohan, A., Gupta, A. K., & Pandey, A. K. (2018). A comparative study between intralesional PPD and vitamin D3 in treatment of viral warts. International Journal of Research in Dermatology, 4(2), 197–201. https://doi.org/10.18203/issn.2455-4529.IntJResDermatol20180953