Selective lymph node sampling in resectable hepatocellular carcinoma: national practice patterns and node positivity rates. (March 2018) - Lee, A.J.; Chiang, Y.J.; Chun, Y.S.; Conrad, C.; Kaseb, A.O.; Raghav, K.P.; Aloia, T.A.; Vauthey, J.N.; Tzeng, C.W.