Hagemann TL, Chen Y, Rosen FS, Kwan SP
Horsch D, Goke R, Eissele R, Michel B, and Goke B
Eugenio Morassi (Division Service for Data Management, Documentation, Library, and Publishing Activities, Istituto Superiore di Sanit, Rome, Italy) for preparing drawings and Letizia Sampaolo (Division Service for knowledge and scientific communication, Istituto Superiore di Sanit, Rome, Italy) for helping with literature search strategy in PubMed/Medline database
The HPLC gradient grade acetonitrile (ACN), used for chromatographic analysis, hydrochloric acid utilized for the standard solution preparation, sodium hydrogen phosphate heptahydrate (Na 2 HPO 4 7H 2 O), sodium dihydrogen phosphate dihydrate (NaH 2 PO 4 2H 2 O) and sodium hydroxide were purchased from J.T