Preventing immortal time and other biases in observational studies via the target trial methodology
Marcel Zwahlen, is an associate professor of epidemiology and biostatistics at the institute of social and preventive medicine (ISPM) in Bern with a first degree in physics from the University of Bern and a PhD in epidemiology from John Hopkins University, Baltimore, USA. Before joining ISPM in 2003, he was head of the scientific office of the Swiss Cancer League and before that head of the section of viral diseases at the Swiss Federal Office of Public Health. He is a methodologist with a long-standing interest and experience in the analysis of observational and longitudinal data. He promotes the use of probabilistic and deterministic record linkage methods to enrich existing data. Other interests include meta-analytic research in cancer and dental medicine. For publications see http://tinyurl.com/y9ef9q24.