BACKGROUND Self-expandable metallic stent(SEMS)is widely used for malignant colorectal obstruction.Recently,SEMS has been used for palliative option for colorec
BACKGROUND Lymph node(LN)metastasis is an important prognostic factor in patients with gastric cancer(GC).However,the evaluation of LN metastasis status in the
Ardak Watershed with an area of about 497 km<sup>2</sup> is one of the tributaries of Kashaf Rud River Watershed in north east Iran,which consists of two main r