Excessive sedentary behaviour during hospitalisations among children and adolescents: a prospective observational study. - Winther L; Stahlhut M; Curtis DJ; Hellum ME; Aaserud KN; Pedersen SV; Christensen J; Kristensen MT; Hjuler T; Frandsen TL; Sørensen JL; Dall CH (European journal of pediatrics, 2026)