Karen's Journal of CSF Leaks and Chronic Pain, 06 Oct 2017 The Afternoon Headache. https://www.ncbi.nlm.nih.gov/pubmed/21811806
Karen's Journal of CSF Leaks and Chronic Pain, 05 Oct 2016 "The Afternoon Headache": https://www.ncbi.nlm.nih.gov/pubmed/21811806