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Description
A., Drasar, B

The association between discrete variables with diagnosis (that is, vitamin B12 deficiency/pernicious anaemia diagnosis) or self-medication (yes/no) was assessed by cross-tabulation and statistically by Pearsons 2 -test or Fishers exact test

doi: 10.1016/s0960-8524(03)00010-5

Similarly, Zeng et al

Prescott in the Lancet and others questioning the ethics of with-holding treatment
