Alali, O. and Noor Aimie-Salleh 2024. Validation of Short-Term and Ultra-Short-Term Heart Rate Variability Measurement Based on Photoplethysmogram Using Commercial Mobile Application. Journal of Medical Device Technology. 3, 1 (Jun. 2024), 45–52. DOI:https://doi.org/10.11113/jmeditec.v3.54.