Article Communication Doctor-patient communication Hospital Anxiety and Depression Scale Humans Iceland Impact of Events Scale Lung Neoplasms Lung cancer diagnosis Post-diagnostic acute stress Posttraumatic stress disorder (PTSD) Prospective cohort study Risk Factors Stress Disorders, Post-Traumatic Surveys and Questionnaires acute stress disorder aged cancer diagnosis cancer patient controlled study doctor patient relationship family female health care personnel human interpersonal communication lung cancer lung tumor major clinical study male