Validity and reliability study of Hospital Anxiety Depression Scale (HADS) in heroin addicts population in Malaysia - Abd Rashid, R.; Irnee, W.A.; Zahari, M.A.; Nordin, A.S.A.; Sulaiman, A.H.; Robson, N.Z.; Peters, H.; Said, M.A.; Harun, N.; Rahim, A.; Habil, H. (2010)