title: Authors reply.
authors: X-W
authors: XW
authors: Cui
authors: C F
authors: CF
authors: Dietrich
mesh_terms: D003287:Contrast Media; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D008113:Liver Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D010743:Phospholipids; D013459:Sulfur Hexafluoride; D014463:Ultrasonography
chemical_list: D003287:Contrast Media; D010743:Phospholipids; D013459:Sulfur Hexafluoride