A study published in the British Medical Journal by researchers at the Nordic Cochrane Center in Copenhagen showed that pharmaceutical companies were not disclosing all information regarding the results of their drug trials. Researchers looked at documents from 70 different double-blind, placebo-controlled trials of selective serotonin reuptake inhibitors (SSRI) and serotonin and norepinephrine reuptake inhibitors (SNRI) and found that the full extent of serious harm in clinical study reports went unreported. These are the reports sent to major health authorities like the U.S. Food and Drug Administration.