Efficacy and safety of single-inhaler triple therapy of glycopyrronium, formoterol and fluticasone in patients with COPD: a double-blind, randomised controlled trial oleh Sundeep Salvi, Akash Balki, Srikanth Krishnamurthy, Sagar Panchal, Saiprasad Patil, Rahul Kodgule, Hitesh Khandagale, Amol Pendse, Wen Wu, Shabbir Rangwala, Monika Tandon, Hanmant Barkate