Nonrandomized Comparative Clinical Studies - Proceedings of the International Conference on Nonrandomized Comparative Clinical Studies in Heidelberg, April 10 -11,1997

U. Abel
Institute of Biometry and Informatics, University of Heidelberg,
Im Neuenheimer Feld 305, 69120 Heidelberg, Germany

A. Koch
Institute of Biometry and Informatics, University of Heidelberg,
Im Neuenheimer Feld 305, 69120 Heidelberg, Germany