Preoperative serum placenta growth factor level as a new marker for stage II or III colorectal cancer patients - KEMİK, Özgür and Sarbay Kemik, Ahu and SÜMER, Aziz and PURİSA, Sevim and TÜKENMEZ, Barış and TÜZÜN, Sefa (Turkish Journal of Gastroenterology, 2012)