Fundamentals of Psychoneuroimmunology Cai Song University of British Columbia, Vancouver, Canada, and Brian E. Leonard National University of Ireland, Galway, Ireland The long-held concept that the nervous, endocrine and immune systems are separate entities has given way to a new understanding of human biology. Psychoneuroimmunology addresses the realisation that the neural, immune, and endocrine systems are inextricably linked and that the effects...