Noghani, M., H. Rezaeizadeh, S. M. B. Fazljoo, M. Yousefifard, and M. Keshavarz. “Gastrointestinal Headache; A Narrative Review”. Archives of Academic Emergency Medicine, vol. 4, no. 4, Dec. 2018, pp. 171-83, doi:10.22037/aaem.v4i4.246.