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front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |review |
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First, we need a
case definition to find cases. In reality, few studies reported case
definitions. Case-control studies are difficult for even trained epidemiologists. Learning various way to select controls will help to conduct case-control studies. |