[1] Univ Med Ctr Utrecht, Wilhelmina Childrens Hosp, Child Dev & Exercise Ctr, NL-3508 AB Utrecht, Netherlands
[2] Univ Med Ctr Utrecht, Cyst Fibrosis Ctr, NL-3508 AB Utrecht, Netherlands
[3] Univ Med Ctr Utrecht, Dept Pediat Resp Med, Wilhelmina Childrens Hosp, NL-3508 AB Utrecht, Netherlands
[4] Vrije Univ Amsterdam, Fac Human Movement Sci, Amsterdam, Netherlands
[5] Partner Shared Utrecht Pediat Exercise Res SUPER, Utrecht, Netherlands