王学院的题为:Early detection of COVID-19 in the UK using self-reported symptoms: a large-scale, prospective, epidemiological surveillance study 的 研究论文。此论文研究结果显示:老年人群(60-79 岁和 80岁以上)更常见的症状是腹泻。发烧虽然 是疾病的一种已知症状，但并不是任何年龄组疾 病的早期特征。 此结论侧重表明

A. 老年病是一种独立于其他类型的疾病

B. 同一种疾病在，老年人发病时的体征与其 他人群可有不同

C. 腹泻比发热在老年人群中更常见

D. 同一种病征在不同年龄阶段表现可有不同

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