«Skin Darkening in COVID-19 Patients: Case Series of Eight Patients in a Hemodialysis Unit». Pakistan Journal of Kidney Diseases 4, no. 03 (январь 31, 2021). просмотрено ноябрь 12, 2026. https://www.pjkd.com.pk/index.php/pjkd/article/view/48.