Safety and efficacy of pulmonary physiotherapy in hospitalized patients with severe COVID-19 pneumonia (PPTCOVID study): A prospective, randomised, single-blind, controlled trial. - Javaherian, Mohammad; Shadmehr, Azadeh; Keshtkar, Abbasali; Beigmohammadi, Mohammad Taghi; Dabbaghipour, Narges; Syed, Aabis; Attarbashi Moghadam, Behrouz (PLoS ONE, 2023)