Introduction

Bipolar disorders, classically known as “manic–depressive psychosis, ” is a serious, chronic, and relapsing mental disorder. Despite the growing efficacy of available pharmacological tools, bipolar-affective disorders have continued to be a significant source of morbidity and mortality, doing serious harm to the quality of life of sufferers. They are the sixth cause of disability worldwide (López and Murray, 1998) and, serious and chronic as they are, represent a heavy financial and social burden – both direct (hospitalizations and consumption of medical resources) and indirect (constant days missed from work and loss of productivity) (Wyatt and Henter, 1995; Goetzel et al., 2003).