Key term: randomization

Original article 2007;33(3):204-215   pdf
Randomized placebo-controlled field study of the effects of bright light and melatonin in adaptation to night work
Bjorvatn B, Stangenes K, Øyane N, Forberg K, Lowden A, Holsten F, Åkerstedt T
 
Editorial 2004;30(5):337-338   pdf
Lack of randomization in occupational epidemiology
Kristensen P