http://www.aidsmap.com/cms1175239.aspx
Hope you find something close.
I'll try to find you another source.
Peter this may make more sense to you than it does me. It doesn't give an address but you may know where it is.
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B82YG-4SVKMMG-JP&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=ea0ea76386da2de69746c0f6bd706f6e