HMDB: The human metabolome database - Wishart, D S; Tzur, D; Knox, C; Eisner, R; Guo, A C; Young, N; Cheng, D; Jewell, K; Arndt, D; Sawhney, S; Fung, C; Nikolai, L; Lewis, M; Coutouly, M A; Forsythe, I; Tang, P; Shrivastava, S; Jeroncic, K; Stothard, P; Amegbey, G; Block, D; Hau, D D; Wagner, J; Miniaci, J; Clements, M; Gebremedhin, M; Guo, N; Zhang, Y; Duggan, G E; MacInnis, G D; Weljie, A M; Dowlatabadi, R; Bamforth, F; Clive, D; Greiner, R; Li, L; Marrie, T; Sykes, B D; Vogel, H J; Querengesser, L (Nucleic Acids Res, 2007)