Tekin, C. and Gunes, G. . (2022) “Investigation of the relationships between life satisfaction, optimism, happiness and blood lipid, vitamin-D levels of individuals aged 55 and over”, Annals of Medical Research, 29(6), pp. 585–594. Available at: http://www.annalsmedres.org/index.php/aomr/article/view/4127 (Accessed: 2 May 2024).