Participants
temporomandibular joints, musculoskeletal dysfunction, headaches, headache
From November 2015 to August 2019, children aged 7–14 years with recurrent headaches were recruited to the trial through the Danish School Information Network, local newspapers, television, social media, and radio. Participants were included in the trial if they (1) were between 7–14 years old, (2) had experienced at least one episode of headache per week for the past 6 months, and (3) had at least one musculoskeletal dysfunction in the spine, pelvis or temporomandibular joints found at the physical screening. Before the screening for the trial, all eligible children and their parents answered three questions each week for four weeks via a text message system on their mobile (number of days with a headache, intensity of headaches and number of pills taken for headache during the previous week), thereby verifying having at least one episode of headache per week for four weeks. In addition, a baseline questionnaire was completed.