Headache Classification Subcommittee of the International Headache Society : The International Classification of Headache Disorders ; 2nd Edition (ICHD-II). Cephalalgia 24 (Suppl. 1) : 79-80, 2004.
Rozen T, Swidan S, Hamel R, et al : Trendelenburg Position : A Tool to Screen for the Presence of a Low CSF Pressure Syndrome in Daily Headache Patients. Headache 48 :1366-1371, 2008.