Costa, Tatiana Munhoz da Rocha Lemos, et al. “Aging Adjusted Serum Levels of Parathyroid Hormone and 25-Hydroxyvitamin D in Outpatients of a Tertiary Care Center Using Generalized Additive Models for Location, Scale, and Shape”. Archives of Clinical and Biomedical Research, vol. 4, no. 6, Nov. 2020, pp. 738-4, https://fortunejournals.org/ojs/index.php/acbr/article/view/14805.