Health literacy on diabetes mellitus among a working population of Mthatha, Eastern Cape Province, South Africa. - Mvuleni, L.; Kah-Keh Nanjoh, M.; Khosa, N. V.; Ncinitwa, A. B. A.; Mabunda, S.A.; Chitha, W. W.; Nomatshila, S. C. (South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde, 2025)