Fleiss J L
Stat Med. 1982 Oct-Dec;1(4):353-9. doi: 10.1002/sim.4780010413.
Most large comparative trials of therapeutic agents are now conducted as multicentre studies. Some of the major studies designed by Bradford Hill were also multicentre, and his methods of design and conduct remain valid today, even though improved methods for analysing the data have appeared subsequently.
目前，大多数治疗药物的大型对比试验都是作为多中心研究开展的。布拉德福德·希尔设计的一些主要研究也是多中心的，尽管后来出现了改进的数据分析法，但他的设计和实施方法至今仍然有效。
