HepFREEPak: protocol for a multi-centre, prospective observational study examining efficacy and impact of current therapies for the treatment of hepatitis C in Pakistan and reporting resistance to antiviral drugs: study protocol. - Arif, Ambreen; Hasnain, Aliya; Chaudhry, Auj; Asim, Muhammad; Shafqat, Muhammad Nabeel; Altaf, Abeer; Saba, Noor; Kemos, Polychronis; Ansari, M. Azim; Barnes, Eleanor; Metcalfe, Chris; Vickerman, Peter; et al. (BMC Public Health, 2023)