The difficulties in determining cause and effect must be acknowledged. Whether a patient’s death or hospitalization is due to a particular drug, the underlying illness, or a combination of the two can be hard to determine.
我们必须看到测定病因和效果中的困难。判定一个病人的死亡或住院治疗是由于某一种药物还是潜在的疾病，或者是两者结合的作用，是十分困难的。但是这使得药物安全更为重要。