Falak Abro, Fozia Baloch, Mehtab Hussain, Asma Noreen, Nadeem Noor, Uzma Arshad, Bushra Rafique. “Vitamin D Deficiency in Critically Ill Children in Karachi”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 03, Apr. 2022, p. 567, doi:10.53350/pjmhs22163567.