Page 32 - ESHRE2019
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  Step 3. Define the methods
  
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  Step 3. Define the methods
  
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– Applies to all comparisons
– Undertaken when heterogeneity is observed
– Keep to a minimum, must have rationale, only undertake on primary or key outcomes
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– How robust are the review results
– Excluding studies at e.g. high risk of selection bias
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