There are other forms of evidence than double-blind studies, as the article rightly points out. See also: https://www.bmj.com/content/327/7429/1459 https://www

There are other forms of evidence than double-blind studies, as the article rightly points out. See also: https://www.bmj.com/content/327/7429/1459 https://www.bmj.com/content/327/7429/1459