Prevalence of headache among handheld cellular telephone users.
Hocking
B
B
D015986:Confounding Factors, Epidemiologic; D003430:Cross-Sectional Studies; D006261:Headache / Q000453:epidemiology* / Q000209:etiology*; D006801:Humans; D015995:Prevalence; D012846:Singapore / Q000453:epidemiology; D013689:Telephone