Illness: while not scientifically proven through double blind studies in prestigious universities it may be an indication that your dog is missing something in its diet. (ovahosp.com)
In this study, the researchers made their findings with a double - blind study of adults, some of whom were healthy and others with metabolic syndrome. (sciencedaily.com)
Then the researchers designed a double - blind study in which volunteers wouldn't know whether they were getting nicotine or a placebo. (sciencedaily.com)