他起源于赫希博士超过25年的大量临床观察研究。
It all began with observations made by Dr. Hirsch over the course of 25 years of clinical research.
Nsaid有可能会对上消化道的所有部分都造成损伤，但是临床研究观察到的多数是在胃部。
Nsaid damage can affect any part of the upper digestive tract, but clinical studies have shown that Nsaid-related ulcers are more commonly found in the stomach.
但是维生素是人们每天摄入的必须营养；没有办法在临床研究中全部去除它们来观察效果。
But vitamins are essential nutrients that people ingest in their daily diets; there is no way to withhold them altogether from research subjects.
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