Data collection will involve mother, father, and the child in the following five consecutive phases:

• Phase 1: Periconception till birth
• Phase 2: Infancy (0-2 years)
• Phase 3: Childhood (3-11 years)
• Phase 4: Adolescence (12-18 years)
• Phase 5: Adulthood (19-30 years)

A description of data collection timeframe is presented in Table 1.

Table 1. The phases and time points of data collection.