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Origanum majorana essential oil exposure (green color, n = 5) did not affect total divergences (DIV) in control subjects exposed to O. majorana (12 NO sessions) as compared to placebo-treated patients (control subjects without stress); these placebo control subjects smell 1% neutral essential oil (blue colour, n = 5, p > 0.05, n.s) impregnated in nasal filters in 12 NO sessions.
