1. Mechanic D. The concept of illness behaviour. J Chr Dis. 1962;15:189–94.
2. Zola IK. Pathways to the doctor – from person to patient. Soc Sci Med. 1973;7:677–89.
3. Aday LA, Andersen R. A Framework for the Study of Access to Medical Care. Health Serv Res. 1974;9(3):208–20.
4. Pescosolido BA, Boyer CA. How do people come to use mental health services? Current knowledge and changing perspectives. In: Horowitz AV, Scheid TL, editors. A Handbook for the Study of Mental Health: Social Context, Theories, and Systems. New York: Cambridge University Press; 1999. p. 392–411.
5. Wagner EH. Chronic Disease Management: What Will It Take to Improve Care for Chronic Illness? Effective Clin Pract. 1998;1(1):2–4.