Calabrese LH,Dodick DW,Schwedt TJ,Singhal AB . Narrative review:reversible cerebral vasoconstriction syndromes .Koopman K,Teune LK,Ter Laan M,Uyttenboogaart M,Vroomen PC,De Keyser J,Luijckx GJ . An often unrecognized cause of thunderclap headache:reversib ......