This author has not been identified. Look up 'Xu Han' in GoogleThis author has not been identified. Look up 'Roland Kwitt' in GoogleThis author has not been identified. Look up 'Stephen R. Aylward' in GoogleThis author has not been identified. Look up 'Spyridon Bakas' in GoogleThis author has not been identified. Look up 'Bjoern H. Menze' in GoogleThis author has not been identified. Look up 'Alexander Asturias' in GoogleThis author has not been identified. Look up 'Paul M. Vespa' in GoogleThis author has not been identified. Look up 'John D. Van Horn' in GoogleThis author has not been identified. Look up 'Marc Niethammer' in Google