Metcalf A (November 1995). "Anorectal disorders. Five common causes of pain, itching, and bleeding". Postgrad Med. 98 (5): 81–4, 87–9, 92–4. doi:10.1080/00325481.1995.11946071. PMID7479460.
Metcalf A (November 1995). "Anorectal disorders. Five common causes of pain, itching, and bleeding". Postgrad Med. 98 (5): 81–4, 87–9, 92–4. doi:10.1080/00325481.1995.11946071. PMID7479460.