(53); October, 1991 Foreword PMCID: PMC2560314 Editor's preface PMCID: PMC2560315 Annual and seasonal variation in the incidence of common diseases. PMCID: PMC2560312 Weekly incidence of chickenpox in 1989 PMCID: PMC2560313 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. Advertisements | ||