headache(38) COVID-19(38) Patient(34) migraine(26) Result(25) reported(23) age(21) Symptom(19) pandemic(18) Frequency(16) significantly(16) Treatment(15) cross-sectional(15) Factor(15) patients(15) Infection(13) Characteristics(12) was performed(12) medication(12) COVID-19 pandemic(12) female(12) supplementary material(11) changes in(11) intensity(10) coronavirus disease(9) neurological(9) disorder(9) Course(9) identify(9) participant(9)