Kalaij, A.G.I., Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia; Dirjayanto, V.J., Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia; Yusuf, S.M., Infectious Disease and Immunology Research Center, Indonesia Medical and Education Research Institute (IMERI), Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia; Nelwan, E.J., Department of Internal Medicine, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia