Valproate in the Treatment of Persistent Chronic Daily Headache. An Open Label Study February 1991 in “ Headache The Journal of Head and Face Pain ” Ninan T. Mathew, Sabiha Ali We don't know much about this study yet. We're maintaining the world's largest resposity of hair loss research. You can help out the community by sending a PDF of this study here . Not sure how to get a study's PDF? You can email the authors of the study. View this study on headachejournal.onlinelibrary.wiley.com →