Two-years antibody responses following SARS-CoV-2 infection in humans: A study protocol. oleh Eggi Arguni, Fatwa Sari Tetra Dewi, Jajah Fachiroh, Dewi Kartikawati Paramita, Septi Kurnia Lestari, Bayu Satria Wiratama, Annisa Ryan Susilaningrum, Bara Kharisma, Yogi Hasna Meisyarah, Merlinda Permata Sari, Zakiya Ammalia Farahdilla, Siswanto Siswanto, Muhammad Farhan Sjaugi, Teguh Haryo Sasongko, Lutfan Lazuardi