Kehler, Tatjana, Tanja Grubić Kezele, Ariana Fužinac-Smojver, and Tamara Kauzlarić-Živković. 2021. “Association of Vitamin D Insufficiency and Low Physical Activity With Fatigue, Headaches and Psychological Distress in College Students, North-Mediterranean Croatia – a Pilot Study”. Paediatria Croatica 65 (2): 59-66. https://doi.org/10.13112/PC.2021.10.