Reliability & validity of the Malayalam hospital anxiety & depression scale (HADS) in cancer patients - B.C. Thomas, Nandakumar Devi Gangadharan Premalatha Sarita, Krishnan Rita, Kunnambath Ramdas B.M. Hussain Ravikumar Rejnish& Manoj Pandey (Indian J Med Res 122, November 2005, pp 395-399, 2005)