Institute of Mathematics, AG Statistics Institute of Neurobiochemistry, AG Proteinchemistry, University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.|Institute of Mathematics, AG Statistics Institute of Neurobiochemistry, AG Proteinchemistry, University of Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.