Serum obestatin/ghrelin ratio is altered in patients after distal gastrectomy - Kim, S; Lee, J H; Heo, J S; Kwak, M J; Kim, S J; Sohn, Y B; Kim, S E; Song, S Y; Choe, Y H; Baek, J W; Rha, M Y; Oh, Y J; Jin, D K (Dig Surg, 2009)