Behavioral Research FKBP5 Humanities NR3C1 North Korean refugees Psychophysiologic Disorders Psychosocial Intervention Social interaction Stress, Psychological acculturative stress adverse childhood experiences attachment child abuse commercial smartwatch cortisol electrodermal activity emotion regulation etiology glucocorticoid receptor glucocorticoids heart rate variability immigrants mental stress parenting self-efficacy physiopathology posttraumatic stress disorder psychophysiological psychosocial well-being psychotherapy qualitative case study