5WHO/UNICEF/ICCIDD.Assessment of Iodine Deficiency Disorders and monitoring their elimination.A Guide for program managers[M].WHO/NUT/01.1,2nd edition,Geneva,2001.31-37.
6WHO/UNICEF/ICCIDD.Recommended iodine levels in salt and guidelines for monitoring their adequacy and effectiveness[M].Geneva:WHO/NUT,1996.2-5.