[1] King Saud bin Abdulaziz Univ Hlth Sci, Pulm Div, Dept Med, Coll Med, King Abdulaziz Med City, Saudi Arabia
[2] Alfaisal Univ, Coll Med, Riyadh, Saudi Arabia
[3] King Faisal Specialist Hosp & Res Ctr, Pulm Div, Dept Med, Riyadh, Saudi Arabia
[4] King Abdullah Int Med Res Ctr, Jeddah, Saudi Arabia
[5] Riyadh Care Hosp, Intens Care Dept, Riyadh, Saudi Arabia
[6] King Abdulaziz Univ, Dept Med, Coll Med, Resp Unit, Jeddah, Saudi Arabia
[7] King Faisal Specialist Hosp & Res Ctr, Infect Dis Div, Dept Med, Riyadh, Saudi Arabia
[8] King Saud Univ, King Khalid Univ Hosp, Pediat Pulmonol Div, Coll Med, Riyadh, Saudi Arabia
[9] King Faisal Specialist Hosp & Res Ctr, Resp Therapy Serv, Riyadh, Saudi Arabia
[10] Univ Sharjah, Dept Clin Sci, Coll Med, Sharjah, U Arab Emirates
[11] Queensland Univ Technol, Childrens Ctr Hlth Res, Brisbane, Qld, Australia
[12] Menzies Sch Hlth Res, Brisbane & Child Hlth Div, Darwin, NT, Australia
[13] Univ MilanInternal, Dept Pathophysiol & Transplantat, Resp Unit, Med Dept, I-20122 Milan, Italy
[14] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Cyst Fibrosis Adult Ctr, Via Francesco Sforza 35, I-20122 Milan, Italy