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Is Opium a Real Risk Factor for Esophageal Cancer or Just a Methodological Artifact? Hospital and Neighborhood Controls in Case-Control Studies
Shakeri R,
Kamangar F,
Nasrollahzadeh D,
Nouraie M,
Khademi H,
et al.
(2012)
Is Opium a Real Risk Factor for Esophageal Cancer or Just a Methodological Artifact? Hospital and Neighborhood Controls in Case-Control Studies.
PLOS ONE 7(3): e32711.
https://doi.org/10.1371/journal.pone.0032711