Department of Protective Medicine, Nanjing Army Medical College, The Second Army Medical University, Nanjing, Jiangsu 210099, China.|Department of Protective Medicine, Nanjing Army Medical College, The Second Army Medical University, Nanjing, Jiangsu 210099, China.|Department of Protective Medicine, Nanjing Army Medical College, The Second Army Medical University, Nanjing, Jiangsu 210099, China.|Department of Protective Medicine, Nanjing Army Medical College, The Second Army Medical University, Nanjing, Jiangsu 210099, China.