Effects of Parkinson's disease on brain-wave phase synchronisation and cross-modulation K. Stumpf, A. Y. Schumann, M. Plotnik, F. Gans, T. Penzel, I. Fietze, J. M. Hausdorff and J. W. Kantelhardt EPL, 89 4 (2010) 48001 Published online: 03 March 2010 DOI: 10.1209/0295-5075/89/48001