1. Richiardi L, Pizzi C, Pearce N. Commentary: Representativeness is usually not necessary and often should be avoided. International Journal of Epidemiology. 2017;42:1018-1022
2. Grimes DA, Schulz KF. Bias and causal associations in observational research. Lancet. 2002;359:248-252
3. Mantel N. Avoidance of bias in cohort studies. National Cancer Institute Monograph. May 1985;67:169-172
4. Gordis L. Epidemiology. 4th ed. Philadelphia: Elsevier; 2009
5. Roy MN, Vollset SE, Gjessing HK, Skjærven R, Melve KK, Schreuder P, Alsaker ER, Haug K, Daltveit AK, Per Magnus. Self selection bias in a large prospective pregnancy cohort in Norway. Paediatric and Perinatal Epidemiology 2009;23:507‐608