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Postdural puncture headache: impact of needle type, a randomized trialCastrillo, Ana; Tabernero, César; García-Olmos, Luis M.; Gil, Cecilia; Gutiérrez, Raúl; Zamora, María I.; Mendoza, Amelia; Rodríguez, María F.; Guerrero, Pilar; Rodríguez-Vico, Jaime S.; Ferrero, Marta; Morollón, Noemí; Duarte, Jacinto · The Spine Journal · 2015