1. Departement of Paediatric, Dr. M. Djamil Hospital Padang, Kota Padang, Indonesia
2. Departement of Child Health, Faculty of Medicine, Universitas Andalas, Padang, Indonesia
3. Eijkman Research Center for Molecular Biology, National Research and Innovation Agency (BRIN), Cibinong, West Java, Indonesia
4. Departement of Microbiology, Faculty of Medicine, Universitas Andalas, Padang, Indonesia