TY - JOUR T1 - Greater occipital nerve block in migraine headache: Letter to editor AU - Baykal, Mehmet Y1 - 2009 PY - 2009 DA - 2009 N1 - doi: DO - T2 - Agri JF - Agri JO - Ağrı SP - 83 EP - 83 VL - 21 IS - 2 SN - M3 - PMID: 19562538 UR - https://dx.doi.org/ Y2 - 2009 ER -