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Chinn S, Zanolin E, Lai E, Jarvis D, Luczynska CM, Burney PG.Chinn S, et al. Among authors: burney pg.Int J Epidemiol. 1995 Jun;24(3):603-11. doi: 10.1093/ije/24.3.603.Int J Epidemiol. 1995.PMID: 7672903
Jarvis D, Lai E, Luczynska C, Chinn S, Burney P.Jarvis D, et al. Among authors: burney p.Br J Gen Pract. 1994 Nov;44(388):493-7.Br J Gen Pract. 1994.PMID: 7748645Free PMC article.