Demir, E. Yancar; Meral, H.; Ozcan, T.
(SAGE PUBLICATIONS LTD1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND, 2015)
Headaches provoked by triggering factors have been recognized for many decades. In many cases, the development of such headaches is secondary to an underlying pathology. However, in some cases, no abnormality can be ...