[1] Univ KwaZulu Natal UKZN, Edendale Hosp, Sch Clin Med SCM, Dept Internal Med, Durban, South Africa
[2] UKZN, Coll Hlth Sci, SCM, Div Internal Med, Durban, South Africa
[3] Mahatma Gandhi Mem Hosp, Durban, South Africa
[4] Univ Witwatersrand, Dept Orthopaed, Johannesburg, South Africa
[5] Univ Cape Town, Fac Hlth Sci, Div Rheumatol, Rondebosch, South Africa
[6] Stellenbosch Univ, Div Orthopaed, Stellenbosch, South Africa
[7] Stellenbosch Univ, Div Endocrinol, Stellenbosch, South Africa
[8] UKZN, Coll Hlth Sci, SCM, Discipline Publ Hlth Med, Durban, South Africa
[9] UKZN, Coll Hlth Sci, SCM, Dept Geriatr, Durban, South Africa