[1] Univ Oslo, Oslo Univ Hosp, Dept Paediat Med, Oslo, Norway
[2] Univ Oslo, Inst Clin Med, Oslo, Norway
[3] Haukeland Hosp, Norwegian Natl Advisory Unit Long Term Mech Venti, Bergen, Norway
[4] UZ Brussel Inkendaal, Ctr Neuromuscular Disorders & Home Mech Ventilat, Inkendaal, Belgium
[5] Haukeland Hosp, Dept Paediat Med, Bergen, Norway
[6] Stavanger Univ Hosp, Dept Paediat Med, Stavanger, Norway
[7] Oslo Univ Hosp, Dept Paediat Med, Oslo, Norway