... professional translator (affiliated with a com-mercial translating service in Canada) performed a singlebackward translation into the original language, for each of the three target languages excluding ... disease-specific quality of life in rare populations: a practical approach to cross-cultural translationVictoria E Price1, Robert J Klaassen2, Paula HB Bolton-Maggs3, John D Grainger4, Christine ... Wood-Dau-phinee S, Gandek B, Wagner A, Aaronson N, Bech P, et al.: Trans-lating health status questionnaires and evaluating their quality: the IQOLA Project approach. International Quality of Life Assessment....