Critical vitamin D and iron intakes in infants aged 6–11 months: results from the nationwide German KiESEL study - Burgard, Leonie; Spiegler, Clarissa; Jansen, Sara; Brettschneider, Anna-Kristin; Straßburg, Andrea; Alexy, Ute; Storcksdieck genannt Bonsmann, Stefan; Ensenauer, Regina; Heuer, Thorsten (Frontiers in Nutrition, 2025)