1. Gran Sasso Science Institute, Viale F. Crispi 7, I-67100 L'Aquila, Italy
2. INFN/Laboratori Nazionali del Gran Sasso, Via G. Acitelli 22, I-67100 Assergi (AQ), Italy
3. Dipartimento di Fisica, Università della Calabria, I-87036 Cosenza, Italy
4. Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
5. Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA