[1] Chelsea & Westminster Hosp, London, England
[2] Bronx VA Med Ctr, New York, NY USA
[3] Hosp Univ Vall dHebron, Barcelona, Spain
[4] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[5] Univ Texas SW Med Ctr Dallas, Dallas, TX 75390 USA
[6] Downtown Infect Dis Unit, Vancouver, BC, Canada
[7] Univ Calif San Francisco, San Francisco, CA 94143 USA
[8] Univ Sao Paulo, Sao Paulo, Brazil
[9] Mt Sinai Sch Med, New York, NY USA