“…Of the 9 nonrandomized studies, 8 collected data prospectively [ 4 , 15 , 27–30 , 32 , 33 ] and 1 collected data retrospectively [ 34 ]. Two of the studies used the same cohort of neonates but reported different outcomes [ 28 , 29 ]. Four studies were conducted in the United States [ 4 , 25 , 26 , 33 ], 4 in Sweden [ 28–31 ], 1 in Kenya [ 27 ], 1 in Mexico [ 32 ], and 2 in Hong Kong [ 15 , 34 ].…”