Muhammad Usman Khalid, Mohammad Hamza Bajwa, Mashal Murad Shah, Syed Nabeel Zafar, Altaf Ali Laghari, Naveed Zaman Akhunzada, Saad bin Anis, Muhammad Faraz Raghib , Sameen Siddiqi and Syed Ather Enam  2022. Factors associated with lost to follow up in patients with brain tumours: A multi-centre study in Pakistan. Journal of the Pakistan Medical Association. 72, 11 (Dec. 2022), S16 - S24. DOI:https://doi.org/10.47391/JPMA.11-S4-AKUB03.