Erratum: Metabolomic characterization of laborers exposed to welding fumes

Kuo Ching Wang, Ching Hua Kuo, Tze Feng Tian, Mong Hsun Tsai, Yin Mei Chiung, Chun Ming Hsiech, Sung Jeng Tsai, San Yuan Wang, Dong Ming Tsai, Chiang Ching Huang, Y. Jane Tseng