Table 3.

National Heart Lung and Blood Institute overall risk of judgement for observational studies

Study	Judgement
Alshafei (2017)6	Fair
Jiang (2016)10	Good
Laws (1996)11	Fair
Lees (1981)12	Fair
Mitchell (2011)46	Good
Neffendorf (2015)43	Good
Rosales (1981)24	Poor
Rush (2001)25	Fair