[1] Univ KwaZulu Natal, Edendale Hosp, Sch Clin Med, Dept Internal Med, 89 Selby Msimang Rd, ZA-3201 Pietermaritzburg, Kwazulu Natal, South Africa
[2] Univ KwaZulu Natal, Coll Hlth Sci, Nelson R Mandela Sch Med, Dept Rheumatol,Dept Geriatr,Div Internal Med, 719 Umbilo Rd, ZA-4001 Durban, South Africa
[3] Stellenbosch Univ, Fac Med & Hlth Sci, Dept Med, Div Endocrinol, Tygerberg Campus,POB 241, ZA-8000 Cape Town, South Africa
[4] Stellenbosch Univ, Fac Med & Hlth Sci, Div Orthopaed, Tygerberg Campus,POB 241, ZA-8000 Cape Town, South Africa
[5] Univ Cape Town, Groote Schuur Hosp Observ, Fac Hlth Sci, Dept Med,Div Rheumatol, Old Main Bldg,J Floor, ZA-7925 Cape Town, South Africa
[6] Univ Witwatersrand, Dept Orthopaed, Wits Div Orthopaed Surg, 1 Jan Smuts Ave, ZA-2000 Johannesburg, South Africa
[7] Univ KwaZulu Natal, Coll Hlth Sci, Nelson R Mandela Sch Med, Dept Geriatr, 719 Umbilo Rd, ZA-4001 Berea, South Africa