Footnotes

• WCLFJ and MSK contributed equally.

• Contributors DLP, MSK, WCL and BCD: designed the study. DLP, BW and NM: collected and analysed the data. DLP: drafted the manuscript. All authors: critically interpreted the data and critically reviewed and edited the manuscript.

• Funding DLP was funded by the National Institute of Mental Health Grant 1K23MH111983-01A1, Sidney R Baer Jr. Foundation and the Massachusetts General Hospital Physician-Scientist Development Award.

• Disclaimer BCD is a consultant at Merck, Med Learning Group and Haymarket; received royalties from Oxford University Press and Cambridge University Press; on the editorial board of NeuroImage: Clinical, Cortex, Hippocampus, Neurodegenerative Disease Management. MSK is a consultant at Forum Pharmaceuticals; editor for Schizophrenia Research. WCL has served on the editorial boards of Epilepsia, Epilepsy & Behavior and Journal of Neuropsychiatry & Clinical Neurosciences; receives editor’s royalties from the publication of Gates and Rowan’s Nonepileptic Seizures, 3rd edition (Cambridge University Press, 2010) and 4th edition (2017); receives author’s royalties for Taking Control of Your Seizures: Workbook and Therapist Guide (Oxford University Press, 2015); has received research support from the NIH (NINDS 5K23NS45902 (principal investigator)), Department of Defense, Rhode Island Hospital, the American Epilepsy Society (AES), the Epilepsy Foundation (EF), Brown University and the Siravo Foundation; serves on the Epilepsy Foundation Professional Advisory Board; has received honoraria for the American Academy of Neurology Annual Meeting Annual Course; has served as a clinic development consultant at University of Colorado Denver, Cleveland Clinic, Spectrum Health and Emory University; and has provided medicolegal expert testimony.

• Competing interests None declared.

• Ethics approval Partners Human Research Committee.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Correction notice Since this letter was first published online the author surname LaFrance has been updated to include the suffix Jr.