Preface The 3rd edition of the Comprehensive Registry of Esophageal Cancer contains the total results for the 2 years from 1998 to 1999. Data were collected using a new meta-analysis type
118 JMAJ, March 2004—Vol. 47, No. 3 Introduction Headache is such a common symptom that almost everyone experiences it now and then, and it is one of the most frequently encoun-