Referances:
[1]- Definition of Headache [Internet].
MedicineNet. 2016 [cited 13 October 2016]. Available from: http://www.medicinenet.com/script/main/art.asp?articlekey=11396
[2]- McIntosh JWebberley D. Headaches: Causes, Diagnosis and Treatments [Internet]. Medical News Today. 2015 [cited 13 October 2016]. Available from:
http://www.medicalnewstoday.com/articles/73936.php