“Efficacy of Arsenicum Album Phosphorus- Tuberculinum (APT) Protocol in Long-term Prevention of COVID-19 – An Observational Study ” (2022) Advancements in Homeopathic Research, 6(4), pp. 18–23. Available at: https://www.journals.acspublisher.com/index.php/ahr/article/view/1866 (Accessed: 12 August 2025).