Influence of opioid analgesia type on circulating tumor cells in open colorectal cancer surgery (POACC-1): study protocol for a prospective randomized multicenter controlled trial

BERTA, E., J. SROVNAL, P. DYTRYCH, J. BRUTHANS, J. ULRICHOVÁ, P. PRASIL, L. VECERA, T. GABRHELIK, B. TOLMACI, J. DUSA, J. MACA, M. MAZACOVA, F. HAJDUK, M. KUTEJ, P. IHNAT, P. MICHALEK, M. HAJDÚCH