1. Graduate University of Science and Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
2. Haiphong University of Medicine and Pharmacy 72A Nguyen Binh Khiem, Ngo Quyen Hai Phong Vietnam
3. Institute for Tropical Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam
4. Vinh University 182 Le Duan Vinh City Vietnam
5. Department of Physics Hanoi University of Mining and Geology 18 Pho Vien, Bac Tu Liem Hanoi Vietnam
6. Thai Nguyen University of Sciences Tan Thinh Ward, Thai Nguyen City 25000 Thai Nguyen Vietnam