K. Levin

Study design III: Cross-sectional studies

K. Levin, 2006, Evidence-Based Dentistry.

Study design II. Issues of chance, bias, confounding and contamination

K. Levin, 2005, Evidence-Based Dentistry.

Multilevel models with multivariate mixed response types

Harvey Goldstein, Michael G Kenward, James Carpenter, 2009 .

Study design

P. Sedgwick, K. Levin, P. Fleuranceau-Morel, 1986, BMJ : British Medical Journal.

Study Design VI - Ecological Studies

K. Levin, 2006, Evidence-Based Dentistry.

Study design V. Case–control studies

K. Levin, 2006, Evidence-Based Dentistry.

Study design VII. Randomised controlled trials

K. Levin, 2007, Evidence-Based Dentistry.

Study design IV: Cohort studies

K. Levin, 2006, Evidence-Based Dentistry.