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Is calculating pack-years retrospectively a valid method to estimate life-time tobacco smoking? A comparison between prospectively calculated pack-years and retrospectively calculated pack-years
Claire M. Bernaards, Jos W. R. Twisk, Jan Snel, Willem Van Mechelen, Han C. G. KemperVolume:
96
Year:
2001
Language:
english
Pages:
9
DOI:
10.1046/j.1360-0443.2001.9611165311.x
File:
PDF, 136 KB
english, 2001