The Journal of Headache and Pain Bendtsen, L, Birk, S, Kasch, H, Ægidius, K L, Sørensen, P S, Thomsen, L L, Poulsen, L, Rasmussen, M-J, Kruuse, C R & Jensen, R H 2012, ' Reference programme: Diagnosis and treatment of headache disorders and facial pain. Danish Headache Society, 2nd Edition, 2012 ', Journal of Headache and Pain, vol. 13, no. Suppl. 1, pp. 1-29 . https://doi.org/10.1007/s10194-011-0402-9 Bendtsen, L, Birk, S, Kasch, H, Aegidius, K, Sørensen, P S, Thomsen, L L, Poulsen, L, Rasmussen, M-J, Kruuse, C R & Jensen, R 2012, ' Reference programme: Diagnosis and treatment of headache disorders and facial pain. Danish Headache Society, 2nd Edition, 2012 ', The Journal of Headache and Pain Online, vol. 13 Suppl 1, pp. 1-29 . https://doi.org/10.1007/s10194-011-0402-9