id	keyword
ejnm-228	study
ejnm-228	preterm
ejnm-228	control
ejnm-228	factors
ejnm-228	birth
ejnm-228	risk
ejnm-228	mothers
ejnm-228	group
ejnm-228	article
ejnm-228	pregnancy
ejnm-228	case
ejnm-228	erbil
ejnm-228	hospital