| Mark Lane Welton The etiology and epidemiology of anal cancerMark Lane Welton Department of Surgery, Stanford University School of Medicine, 300 Pasteur Drive, Room H 3680J, Stanford, CA 94305 5655, USA Surg Oncol Clin N Am 13:263-75. 2004 Anal cancer and its precursors in HIV-positive patients: perspectives and managementJ Michael Berry General Clinical Research Center, University of California San Francisco School of Medicine, 505 Parnassus Avenue, Room M1203, Box 0126, San Francisco, CA 94143, USA Surg Oncol Clin N Am 13:355-73. 2004
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