1. Estimating the true global burden of mental illness
2. American Psychiatric AssocationInternet2018-07-03Diagnostic and statistical manual of mental disorders (5th edition) https://dsm.psychiatryonline.org/doi/book/10.1176/appi.books.9780890425596
3. Pew Research CenterUS Smartphone Use in 2015 http://www.pewinternet.org/2015/04/01/us-smartphone-use-in-2015/
4. Ecological Momentary Assessment