Schoenberg B S
Adv Neurol. 1982;36:547-53.
Many of the difficulties inherent in the design and implementation of controlled therapeutic trials have been discussed. Future studies must carefully address these issues. Perhaps the most practical advice on how these investigations should be carried out was offered by Cornfield, when he warned: "Be careful." (13)
人们已经讨论了对照治疗试验在设计和实施过程中固有的许多困难。未来的研究必须认真解决这些问题。关于应该如何开展这些调查，或许最实用的建议是科恩菲尔德给出的，当时他警告说：“要谨慎。”(13)
