Casecontrol study的用法和样例：
例句
- Now, investigators have conducted a large population-based case-control study to evaluate the relation between PPI use and CAP.
现在，研究者进行一个大样本的病例对照研究来评估两者的相关性。 - The independent association between FL and angiographic CAD was assessed in this case?control study by considering the contribution of their shared risk factors.
通过病例对照研究，考虑脂肪肝和冠状动脉疾病的共同的危险因素，研究两种疾病之间是否存在独立联系。
