title: Gathering evidence and assessing biases.
authors.affiliation: MRC Environmental Epidemiology Unit, University of Southampton, UK. cmn1@soton.ac.uk
authors.forename: C
authors.initials: C
authors.lastname: Martyn
mesh_terms: D015982:Bias; D019317:Evidence-Based Medicine; D006801:Humans; D009747:Nutritional Physiological Phenomena