title: Invited commentary: missing doses in the life span study of Japanese atomic bomb survivors.
abstract: The Life Span Study is a long-term epidemiologic cohort study of survivors of the atomic bombs dropped on Hiroshima and Nagasaki, Japan. In this issue of the Journal, Richardson et al. (Am J Epidemiol. 2013;177(6):562-568) suggest that those who died in the earliest years of follow-up were more likely to have a missing dose of radiation exposure assigned, leading to a bias in the radiation risk estimates. We show that nearly all members of the cohort had shielding information recorded before the beginning of follow-up and that much of the alleged bias that Richardson et al. describe simply reflects the geographic distribution of shielding conditions for which reliable dosimetry was impossible.
authors: K
authors: K
authors: Ozasa
authors: E J
authors: EJ
authors: Grant
authors: H M
authors: HM
authors: Cullings
authors: R E
authors: RE
authors: Shore
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009381:Neoplasms, Radiation-Induced / Q000401:mortality*; D054043:Nuclear Weapons; D011829:Radiation Dosage; D017741:Survivors