AUTHOR=Greenspan Neil S. TITLE=Design Challenges for HIV-1 Vaccines Based on Humoral Immunity JOURNAL=Frontiers in Immunology VOLUME=5 YEAR=2014 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2014.00335 DOI=10.3389/fimmu.2014.00335 ISSN=1664-3224