Longitudinal Assessment

We have a proven record of following evolution of symptoms and diseases over time in the general population using representative census-based samples, as well as in specific conditions.
Since 2001, we have regularly, at intervals of 3-4 years, monitored the sleep habits and disorders of the US general population.
We have done the same evaluations in the major countries of Europe and in Asia, we have evalualed the South Korean population two times.
Hundreds of peer reviewed papers, abstracts were published in scientific journals.