Prospective Evaluation of Antibody Response post COVID-19 vaccination in older persons ≧ 60 years old (PEARL 60): A longitudinal 15-months study in a tertiary centre in Malaysia - Kejal Hasmukharay; Ashutosh Kumar Verma; Kiirtaara Aravindhan; Prakhaash Raaj S. Alagappan; Aisya Karynna Md Kamal; Nurul Syuhada Zulhaimi; Nor Izzati Saedon; Jamal I-Ching-Sam; Tan Maw Pin; Reena Rajasuriar (PLoS ONE, 2026)