“…monitoring of a child's health and dealing with multiple health issues simultaneously may also be beneficial [59,60]. Like many other populations, incentives for participation, such as transportation reimbursements, may improve research recruitment and retention [41,43,44,48,52,54,56,57,60]. A common theme in successful recruitment and retention of pregnant women and children was that personalized interaction with study personnel helped build relationship and engender trust [44,45,52,55,57,60].…”