3Simanovsky N, Hiller N. Importance of sonographic detection of enlarged abdominal lymph nodes in children. J Uhrasound Med. 2007,26 (5) :581 - 584.
4Moritz JD,ludwig A, Oestmann JW. Contrast-enhanced color Doppler sonography for evaluation of enlarged cervical lymph nodes in head and neck tumors. Am J Roentgenol ,2000,174 (5) : 1279 - 1284.