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crossref
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pubmed
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europepmc
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10.1093/ije/31.1.140
10.1093/ije/31.1.140 · 2002
10.1136/bmj.316.7127.285
10.1136/bmj.316.7127.285 · 1998
Unresolved referenced work
2000
10.1093/fampra/18.6.565
10.1093/fampra/18.6.565 · 2001
10.1016/s0090-4295(02)01805-8
10.1016/s0090-4295(02)01805-8 · 2002
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