1. From the The School of Public Health, Guangxi Medical University, Nanning, Guangxi, People's Republic of China; 2Centre for Biophotonics, Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom;
2. Centre for Biophotonics, Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom;
3. From the The School of Public Health, Guangxi Medical University, Nanning, Guangxi, People's Republic of China; 3The School of Public Health, Guilin Medical University, Guilin, Guangxi, People's Republic of China; and
4. The Structural Biophysics Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, Wales, United Kingdom.