Performance of a Point-of-Care Fluorescence Immunoassay Test to Measure the Anti-Severe Acute Respiratory Syndrome Corona Virus 2 Spike, Receptor Binding Domain Antibody Level oleh Marita Restie Tiara, Hofiya Djauhari, Febi Ramdhani Rachman, Antonius Christianus Rettob, Darmastuti Utami, Fahda Cintia Suci Pulungan, Heru Purwanta, Rudi Wisaksana, Bachti Alisjahbana, Agnes Rengga Indrati