TY - JOUR T1 - The comparison of postoperative analgesic effects of preemptive ketamine and fentanyl use in mastectomy operations AU - Öğün, C. Öztin AU - Duman, A. AU - Ökesli, S. Y1 - 2001 PY - 2001 DA - 2001 N1 - doi: DO - T2 - Agri JF - Agri JO - Ağrı SP - 31 EP - 40 VL - 13 IS - 2 SN - M3 - doi: UR - https://dx.doi.org/ Y2 - 2001 ER -