1. Koehler PJ. Prevalence of headache in Tulp’s Observationes Meddicae (1641) with a description of cluster headache. Cephalalgia. 1993;13:318–20.
2. Willis T. De Anima Brutorum, quae hominis vitalis ac sensitive est, exercitationes duae. Pars 2,C.II:303. Oxford: Theatro Sheldoniano; 1672.
3. De la Pryme A. Extracts of two letters from the reverend Mr Abraham de la Pryme, F.R.S. to the publisher, concerning subterraneous trees, bitings of mad dogs, etc. Philos Trans. 1702;23:1073–7.
4. Arkink EB, van Buchem MA, Haan J, Ferrari MD, Kruit MC. An early 18th-century case description of cluster headache. Cephalalgia. 2010;30:1392–5.
5. Van Swieten G. Commentaria in Hermanni Boerhaave Aphorismos de cognoscendis et curandis morbis, vol. II. Lugduni Batavorum (Leiden): Apud Johannem et Hermanum Verbeek; 1745.