Efektivitas Terapi Latihan Diafragma Modifikasi Pada Dewasa Pasca Covid-19 Dengan Refluks Gastroesofagus, Kajian Terhadap: Tekanan Inspirasi Maksimal, Ekskursi Diafragma Dan Fungsi Paru = Effects of Modified Diaphragmatic Training on Gastroesophageal Reflux Disease Questionnaire Score, Diaphragmatic Excursion, and Maximum Inspiratory Pressure in Adults with Gastroesophageal Reflux Disease After COVID-19