| Authors | Reasons |
| MABULA (Tanzania 2012) | Poverty |
| AHMED (Nigeria 2011) | Poverty |
| OSIME (Nigeria 2010) | Poor general condition of patients |
| BERKANE (Algeria 2007) | Uncommonness |
| ZONGO (Burkina 2011) | Poverty |
| NTAKIYIRUTA (Rwanda 2009) | No drugs, No specialists, Poverty. |