Nieto, J. ., Zhu, J. ., Duan, B. ., Li, J. ., Zhou, P. ., Paka, L. ., … Narayan, P. . A modified elliptical formula to estimate kidney collagen content in a model of chronic kidney disease. PloS One, 13(1), e0190815. https://doi.org/10.1371/journal.pone.0190815 (Original work published 2018)