Introduction of bias by merging patients with initial surgery and reoperations in analysis of survival. Annals of surgery [Ann Surg] Journal article

Title	Introduction of bias by merging patients with initial surgery and reoperations in analysis of survival.
Author(s)	Machens A, Dralle H
Source	Ann Surg 2008 Jul; 248(1):137; author reply 137-8.
MeSH	Carcinoma, Medullary Epidemiologic Research Design Humans Kaplan-Meiers Estimate Referral and Consultation Reoperation Selection Bias Survival Rate Thyroid Neoplasms Time Factors Treatment Outcome
Language	eng
Pub Type(s)	Comment Letter
PubMed ID	18580218

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