81 e-Letters

published between 2006 and 2009

  • Re: Occupation and malignant lymphoma
    Wenbin Liang

    Dear Editor,

    As it had been discussed in the study[1], selection bias may affect the validity of the result. In this case there would be selection bias, if the response rate in the survey associated with occupation, and the distribution of occupation among controls did not reflect that among the general population. However, if the response rate was independent from occupations, health status, other lifestyle, se...

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