Weng X, Xing Y, Liu J, et al.
Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases.
2013;
Ojinmah U R, Onyekonwu C L, Ozoh G A, et al.
Nigerian journal of medicine : journal of the National Association of Resident Doctors of Nigeria.
2012;
21 (4) : 427-31.