Table 2.

Specification of subjects.

Study	Cu	Cr	Fe	Mn	Zn
[23]	Terms	Preemies	Preemies	Terms	Terms
[28]	Preemies	Preemies	Preemies	Preemies	Terms
[25]	Preemies, Full term, Gestational diabetes				Preemies, Full term, Gestational diabetes
[18]	Healthy, Preemies, non-surviving				Healthy, Preemies, non-surviving