Sarwat Iqbal, Mujeeb-ur-Rehaman Abid Butt, Uzma Sarwar, and Arshad Ullah Afridi, “Frequency of primary headache disorders and association with body mass index; an ambispective study”, J Pak Med Assoc, vol. 72, no. 10, pp. 1968–1970, Sep. 2022.