1. Decreasing incidence of adenotonsillar problems in Dutch general practice: real or artefact? by Marion CJ Biermans, Ellen HM Theuns-Lamers, Peter Spreeuwenberg, Robert A Verheij, Johannes C van der Wouden, Pieter F de Vries Robbé, and Gerhard A Zielhuis BJGP Volume 59(569):e368-e375 December 1, 2009 ©2009 by British Journal of General Practice

2. Adjusted incidence rates (basic model) of hypertrophy and recurrent infections of the tonsils/adenoids among children aged 0–14 years. Marion CJ Biermans et al. Br J Gen Pract 2009;59:e368- e375 ©2009 by British Journal of General Practice

3. Raw incidence rates of clusters of substitution codes and upper respiratory diseases among children aged 0–14 years. Marion CJ Biermans et al. Br J Gen Pract 2009;59:e368- e375 ©2009 by British Journal of General Practice

4. Adjusted incidence rates (various models) of hypertrophy and recurrent infections of tonsils/adenoids among children aged 0–14 years. Marion CJ Biermans et al. Br J Gen Pract 2009;59:e368- e375 ©2009 by British Journal of General Practice

5. Adjusted incidence rates (basic model) among children aged 0–14 years of clusters of clinical manifestations of pathogens found in hypertrophy and recurrent infections of the tonsils/adenoids. Marion CJ Biermans et al. Br J Gen Pract 2009;59:e368- e375 ©2009 by British Journal of General Practice