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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; Syed Ather Enam . Factors Associated With Lost to Follow up in Patients With Brain Tumours: A Multi-Centre Study in Pakistan. J Pak Med Assoc 2022, 72, S16 - S24.