1. Translational Research Unit, Department of Epidemiology and Preclinical Research; National Institute for Infectious Diseases “L. Spallanzani”; Rome Italy
2. Department of Internal Medicine; National Taiwan University Hospital; Hsinchu Taiwan
3. Department of Internal Medicine; National Taiwan University Hospital; Taipei Taiwan
4. Department of Epidemiology; Colorado School of Public Health; Aurora CO USA
5. Department of Infectious Diseases; Leiden University Medical Center; Leiden The Netherlands