Prevalence and associated factors of delayed sputum smear conversion in patients treated for smear positive pulmonary tuberculosis: a retrospective follow up study in Sabah, Malays... by Khor, Linghui Amanda, A. Wahid, Ulfa Nur Izzati, Ling, Lee Lee, Liansim, Sarah Michael S., Oon, Jush’n, Balakrishnan, Mahendran Naidu, Ng, Wei Leik, Cheong, Ai Theng