Porta-Etessam J, Cuadrado ML, Galán L, Sampedro A, Valencia C. Temporal response to bupivacaine bilateral great occipital block in a patient with SUNCT syndrome. J Headache Pain. 2010 Apr;11(2):179. doi: 10.1007/s10194-010-0204-5. PubMed PMID: 20232223; PubMed Central PMCID: PMC3452296.