TY - RPRT TI - Helicobacter pylori and the birth cohort effect: evidence of a continuous decrease of infection rates in childhood. AU - R Roosendaal AU - E J Kuipers AU - J Buitenwerf AU - C van Uffelen AU - S G Meuwissen AU - G J van Kamp AU - C M Vandenbroucke-Grauls PY - 1997 UR - https://pubmed.ncbi.nlm.nih.gov/9317067/ ID - 9317067 ER -