1. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
2. Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA
3. Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
4. College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
5. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK