This study was supported by the National Natural Science
Foundation of China (No. 41361111 and No. 41461019), the Fok Ying
Tung Foundation (No. 141084), the Natural Science Foundation of
Jiangxi Province (No. 20142BAB203028), the Technology Foundation
of Jiangxi Education Department of China (No. KJLD14033 and
No. GJJ14346), and the Social Science Foundation of Jiangxi
Province (No. 13GL05).