IL6 and major depressive disorder: Psychological well-being: Ryff’s scales of psychological well-being (/);Depression: SDS (/);Anxiety: SAS (/);Social connectedness: Positive relations with others (+), Friendship Scale (/);Satisfaction with Life Scale (/);Inflammatory cytokine: IL-6 (+), IL-1β (/), HCRP (/), Sgp-130(/);Stress: cortisol (/), DHEA (/);Cognitive function: MoCA (/)