TY - JOUR TI - Comparison of the Efficacies of Ketamine and Fentanyl on Prevention of Early Post-Operative Pain After Tonsillectomy AU - Öksüz, H. AU - Şenoğlu, N. AU - Doğan, Z. JO - Journal of Clinical Practice and Research PY - 2009 VL - 31 SP - 27 EP - 30 DO - ER -