1. Section of Geriatrics, Department of Medicine, Temple University, Philadelphia, Pennsylvania, USA.
2. HIV Netherlands Australia Thailand (HIV-NAT) Research Collaboration, Thai Red Cross AIDS Research Centre, Bangkok, Thailand.
3. Department of Geriatrics and Palliative Care, Medical College of Wisconsin, Wauwatosa, Wisconsin, USA.
4. Department of Medicine, Montefiore Medical Center, New York, New York, USA.
5. Division of Allergy and Immunology, Department of Medicine, Chulalongkorn University, Bangkok, Thailand.