Widjanantie, Siti Chandra, Ari Fahrial Syam, Nury Nusdwinuringtyas, Agus Dwi Susanto, Rudy Hidayat, Aria Kekalih, Maria Regina Rachmawati, Maryastuti Maryastuti, Triya Damayanti, Putri Prathiwi, Won Ah Choi, and Seong Woong Kang. “Prediction Equations for Calculating Maximal Inspiratory Pressure from Spirometry and Thoracic Ultrasound After COVID-19 With Gastroesophageal Reflux Disease in Indonesian Adults: A Cross-Sectional Study”. Acta Medica Indonesiana 56, no. 3 (October 25, 2024): 314. Accessed November 12, 2025. http://actamedindones.org/index.php/ijim/article/view/2675.