Most of these organizations were never allowed back into the Sudan, leaving much smaller NGOs to take over programming for health and education services, which they were not equipped for.  Similarly, in 2009 Ethiopia suspended the operations of around 40 NGOs, (mostly smaller organizations) for operations "outside of their mandate".  While these sorts of situations occur infrequently, it does point to one of the real issues with the reliance on NGOs in conflict situations.  If the government does not support their mission, they can be kicked out, leaving vulnerable populations without access to basic health care.