求翻译：不仅因为它的发生率是基于医院数据，与数据精确性又被数据的收集方法大大地影响，还因为考虑疾病严重性的不同和疾病诊断的困难。是什么意思？

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Not only because it is based on the rate of occurrence, and hospital data and accuracy of the data and the data collection method greatly influence, and also because it takes into account the different disease severity and the difficulty of diagnosing disease.

Not only because its formation rate is based on the hospital data, greatly is affected with the data accuracy by the data collection method, but also because consideration disease grave different and disease diagnoses difficulty.

Not only because it is based on the incidence of hospital data, and data accuracy is greatly affected by data collection methods, also taking into account different disease severity and disease diagnosis difficult.

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