Mental, neurological and substance-use disorders account for 9 out of the 20 leading causes of years lived with disability worldwide (more than a quarter of all measured disability) and 10% of the global burden of disease (which includes deaths as well as disability) (1,2). A recent analysis by the World Economic Forum estimated that the cumulative global impact of mental disorders in terms of lost economic output will amount to US$ 16 trillion over the next 20 years (3). Such an estimate marks mental health out as a highly significant concern, not only for public health but also for economic development and societal welfare.