“…First, some studies used either convenience11,12,20,40,44,47,49 or restricted patient samples16,20–22,32,39,47 that may have resulted in selection biases or findings with limited generalizability. Several studies had small sample sizes,11,12,20,40,44,47,49 with a consequent lack of statistical power. Many studies relied primarily on information from medical records which may be associated with information bias5,7–9,16–18,30,37,39 and may not have precisely characterized extent of delay in comparison to data collected through in person interviews.…”