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Survival analysis of under-five mortality using Cox and frailty models in Ethiopia.
Ayele DG, Zewotir TT, Mwambi H.
J Health Popul Nutr. 2017 Jun 2;36(1):25. doi: 10.1186/s41043-017-0103-3.
https://jhpn.biomedcentral.com/track/pdf/10.1186/s41043-017-0103-3