[1] Yaounde Rheumatol Res Team, Yaounde, Cameroon
[2] Univ Yaounde I, Fac Med & Biomed Sci, Dept Internal Med & Specialties, Yaounde, Cameroon
[3] Univ Oxford, NufIeld Dept Populat Hlth, Oxford, England
[4] Yaounde Cent Hosp, Rheumatol Unit, Yaounde, Cameroon
[5] Cheikh Anta DIOP Univ, Dantec Teaching Hosp, Dept Rheumatol, Dakar, Senegal