Quratulain, Bakhtiar Ahmed Bhanbhro, Asif Ali Khuhro, Sonia Saleem, Bismah Memon, Amanullah Lail. “Correlation Between Infantile Vitamin D Insufficiency and the Incidence of Acute Lower Respiratory Tract Infections”. Pakistan Journal of Medical & Health Sciences, vol. 17, no. 06, Sept. 2023, p. 298, doi:10.53350/pjmhs2023176298.