P258: Diversity of CFTR mutations in a Pakistani population: Implications for comprehensive genetic testing and genetic counseling in cystic fibrosis oleh Anum Safdar, Muhammad Usman Ghani, Iqbal Bano, Tahir Mehmood, Ali Akbar, Farheena Iqbal Awan, Hassan Rafique, Muhammad Farooq Sabar, Muhammad Tajamal, Rehan Sadiq Shaikh