|   Research Center  |       Most Common Cause (%)  |    
|   Affiliated Hospital of Dali University (2013, 2014)  |       Megaloblastic anemia (28%)  |    
|   On the basis of research of BMJ 2013 [6]  |       Hypersplenism (29.2%)  |    
|   On the basis of Indian Journal published on 2014 [7]  |       Megaloblastic anemia (66%)  |    
|   Journal of Pathology of Nepal (2012) [8]  |       Hypoplastic bone marrow (29.6%)  |