enquête (1) stress (1) recherche (1) projet (1) santé (1) Aging (1) Description and travel (1) States (1) Work (1) Twins (1) Telephone (1) Social indicators (1) Satisfaction (1) Research (1) Postal service (1) Optimism (1) Middle age (1) Mental health (1) Manufacturers' agents (1) Lifestyles (1) Life change events (1) Life (1) Health (1) Comprehension (1) Commission merchants (1) Brothers and sisters (1) Americans (1) Aging (1) Older people (1) Adulthood (1)