1. DEFIS, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, 35400-000 Ouro Preto, Minas Gerais, Brazil
2. Department of Applied Mathematics and Theoretical Physics, Cambridge University, Cambridge, United Kingdom
3. LE STUDIUM, Loire Valley Institute for Advanced Studies, Tours and Orleans, France
4. Laboratoire de Mathématiques et de Physique Théorique, Tours University, Tours, France
5. NIKHEF, Amsterdam, Netherlands
6. Leiden University, Leiden, Netherlands
7. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
8. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China