Anal Squamous Intraepithelial Lesions (SILs) in Human Immunodeficiency Virus–Positive Men Who Have Sex With Men: Incidence and Risk Factors of SIL and of Progression and Clearance of Low-Grade SILsVita W. Jongen, Maarten F. Schim van der Loeff|The Journal of Infectious Diseases|2019Cited by 30