This author has not been identified. Look up 'Oliver Schmitt' in GoogleThis author has not been identified. Look up 'Jan Modersitzki' in GoogleThis author has not been identified. Look up 'Stefan Heldmann' in GoogleThis author has not been identified. Look up 'Stefan Wirtz' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Bernd Fischer' in Google