This author has not been identified. Look up 'Sven Groppe' in GoogleThis author has not been identified. Look up 'Thomas Kiencke' in GoogleThis author has not been identified. Look up 'Stefan Werner' in GoogleThis author has not been identified. Look up 'Dennis Heinrich' in GoogleThis author has not been identified. Look up 'Marc Stelzner' in GoogleThis author has not been identified. Look up 'Le Gruenwald' in Google