Economic burden of chronic obstructive pulmonary disease in Morocco: a cost of illness study oleh Soumaya Benmaamar, Btissame Es-sabbahi, Mohammed Taghyioullah Haiba, Mohamed Omari, Ibtissam El Harch, Mohammed Youbi, Latifa Belakhhel, Loubna Abousselham, Hafid Hachri, Imane El Menchawyi, Samira EL Fakir, Mohammed Chakib Benjelloun, Nabil Tachfouti