1. Tokyo Electron Technology Solutions Limited, Iwate 023-1101, Japan
2. Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 201210, China
3. Research Center for Intelligent Computing Platforms, Zhejiang Laboratory, Hangzhou 311100, China
4. Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Iwate 023-0861, Japan
5. Academic Support Center, Kogakuin University of Technology and Engineering, Tokyo 192-0015, Japan
6. Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
7. Massachusetts Institute of Technology Haystack Observatory, Westford, MA 01886, USA
8. Black Hole Initiative, Harvard University, Cambridge, MA 02138, USA
9. School of Physics & Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
10. Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany
11. Department of Astronomy, Yonsei University, Seodaemun-gu, Seoul 03722, Republic of Korea
12. Korea Astronomy and Space Science Institute, Yuseong-gu, Daejeon 34055, Republic of Korea
13. Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, Tokyo 181-8588, Japan
14. Institute of Astronomy, The University of Tokyo, Tokyo 181-0015, Japan
15. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
16. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China
17. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
18. Xinjiang Astronomical Observatory, CAS, 150 Science 1-Street, Urumqi 830011, China
19. Center for Astronomy, Ibaraki University, Ibaraki 310-8512, Japan