Trenkwalder, C., Seidel, V. C., Kazenwadel, J., Wetter, T. C., Oertel, W., Selzer, R., & Kohnen, R. (2003). One-year treatment with standard and sustained-release levodopa: Appropriate long-term treatment of restless legs syndrome? Movement Disorders, 18(10), 1184-1189.