Arshad, K. .; Sheikh, S. .; Naqvi, S. U.- ul-B.; Virk, A. O.; Butt, M. A. Efficacy of Lactobacillus Acidophilus DDS-1, Lactobacillus Bulgaricus, Bifidobacterium Infantis in the Prevention of Necrotizing Enterocolitis in Preterm Neonates. apmc 2016, 10, 131-135.