[1] Danish Comm Hlth Educ, DK-2100 Copenhagen, Denmark
[2] Univ Southern Denmark, Inst Clin Res, Res Unit Nursing, DK-5220 Odense, Denmark
[3] Aarhus Univ Hosp, Dept Pediat, DK-8200 Aarhus, Denmark
[4] Univ Copenhagen, Dept Publ Hlth, Sect Social Med, DK-1014 Copenhagen K, Denmark
[5] Univ Southern Denmark, Inst Clin Res, DK-5220 Odense, Denmark
[6] Aarhus Univ, Dept Publ Hlth, Sect Nursing, DK-8000 Aarhus C, Denmark