Introduction

This is the authors' abstract. We don't add key points for this paper.

*University of California, San Francisco, Positive Health Program, San Francisco, California, U.S.A.; and† University of Amsterdam, Academic Medical Center, Amsterdam, The Netherlands Address correspondence and reprint requests to Paul Volberding, University of California, San Francisco, Positive Health Program, 995 Potrero Avenue, San Francisco, CA 94110-2897 U.S.A.; e-mail: [email protected]