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Martinez-Martin, Pablo, Rodriguez-Blasquez, C., Abe, Kapil, Bhattacharyya, K.B., Bloem, B.R., Carod-Artal, F.J., Prakash, R., Esselink, R.A.J., Falup-Pecurariu, C., Gallardo, M., Mir, P., Naidu, Yogini, Nicoletti, A., Sethi, Kapil, Tsuboi, Y., van Hilten, J.J., Visser, M., Zappia, M. and Chaudhuri, Kallol Ray (2009) International study on the psychometric attributes of the Non-Motor Symptoms Scale in Parkinson disease. Neurology, 73 (19). pp. 1584-1591. ISSN 0028-3878

Chaudhuri, Kallol Ray and Naidu, Yogini (2008) Early Parkinson's disease and non-motor issues. Journal of Neurology, 255 (S5). pp. 33-38. ISSN 0340-5354