Afzal, A., S. Shaukat, M. Zahoor, M. Rafat, D. A. Kazmi, and M. Nadeem. “Frequency of Positive Patch Tests to Nickel in Patients Suspected of Metal Contact Dermatitis”. Journal of Pakistan Association of Dermatologists, vol. 28, no. 4, Feb. 2019, pp. 462-7, https://jpad.com.pk/index.php/jpad/article/view/1307.