Vitamin D status and its determinants during autumn in children at northern latitudes: a cross-sectional analysis from the optimal well-being, development and health for Danish children through a healthy New Nordic Diet (OPUS) School Meal Study
OPUS
Opus Quadratum
Opus
Opus Alchymicum
Opus Posthumous
Opus Anglicanum
Opus Fidiae, opus Praxitelis
opus incertum