RT Journal Article SR Electronic T1 Correlation of sleep disorder and Parkinson’s disease severity in Turkish patients JF Neurosciences Journal JO Neurosciences (Riyadh) FD Prince Sultan Military Medical City SP 298 OP 299 VO 14 IS 3 A1 Okuyucu, Esra E. A1 Duman, Taskin A1 Melek, Ismet M. A1 Seydaoglu, Gulsah YR 2009 UL http://nsj.org.sa/content/14/3/298.abstract AB