1. Department of English, National Taiwan Normal University, 162 Heping East Road, Daan District, Taipei City 106, Taiwan
2. Department of Communication Sciences and Disorders, University of Alberta, 8205 114 Saint Edmonton, Alberta, T6G 2G4, Canada
3. Department of Linguistics, University of Illinois Urbana-Champaign, 707 South Mathews Avenue, MC-168, Urbana, Illinois 61801, USA