Depression is a common, chronic, and impairing disorder with first onset often occurring during adolescence¹ and affecting close to a quarter of all adults during their lifetime.² The World Health Organization³ estimates that depression is the third leading cause of global disease, is projected to be the second leading cause by 2020, and will rank first in high-income countries by 2030.⁴ Thus, depression is a major public health problem that requires the development, implementation, and evaluation of strategies for preventing its onset and recurrence.