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Peri-ampullary collision tumor - high grade neuroendocrine ..:

Anuj Khurana ; Anila Sharma ; Gurudutt Gupta.
http://www.ijpmonline.org/article.asp?issn=0377-4929;year=2011;volume=54;issue=1;spage=161;epage=163;aulast=Khurana.  , 2011