Mobile Screening for Major Depressive Disorder in Adults From an Ethnically and Socioeconomically Diverse Population.

Both intervention arms will have 4-weekly screening with either lenient follow-up or screening with stricter follow-up for a time period of one year. Data will be collected via an app designed by Your Research which runs on Microsoft Azure server, as the primary of participants' response collection. A dedicated backup system will serve as a secondary data collection.