[1] Univ Hosp, Dept Phys Med & Rehabil, Newark, NJ USA
[2] Univ Pittsburgh, Dept Paediat, Pittsburgh, PA USA
[3] Sacra Famiglia Inst Fdn, Rehabil Dept, Milan, Italy
[4] Univ Cattolica Sacro Cuore, Policlin A Gemelli, Gen Intens Care Unit, I-00168 Rome, Italy
[5] Univ Hosp Padova, Resp Pathophysiol Unit, Padua, Italy
[6] Nigrisoli Hosp, Neuromuscular Unit, Bologna, Italy
[7] Univ Hosp S Joao, Dept Pulmonol, Lung Funct & Rehabil Unit, Oporto, Portugal
[8] Alberta Childrens Prov Gen Hosp, Div Paediat Respirol, Calgary, AB, Canada
[9] Ottawa Hosp, Rehabil Ctr, Div Resp Med, Ottawa, ON, Canada
[10] Univ Hosp Valencia, Dept Resp Med, Rehabil & Ventilat Unit, Valencia, Spain