Quality improvement in medicines regulation: a retrospective analysis of the Pharmacy Board of Sierra Leone before and during quality management system implementation oleh Michael Lahai, Laurie Lake, Ahmed Vandy, Bondu Sebba, Mohamed Sesay, Onome T. Abiri, Joy Johnson, Tamba Buffa, Abdulai Kanu, Mohamed Bawoh, James P. Komeh, Wiltshire C.N Johnson