TY - RPRT TI - Change in frequency pattern in cluster headache induced by subcutaneous sumatriptan. AU - Vinod Kumar Gupta PY - 2005 DO - 10.1111/j.1526-4610.2005.05195_2.x UR - https://pubmed.ncbi.nlm.nih.gov/16109129/ ID - 16109129 ER -