TY  - RPRT
TI  - NPO includes chewing gum.
AU  - B Kradel
AU  - A Hackett
AU  - R Johnstone
PY  - 1992
DO  - 10.1213/00000539-199204000-00032
UR  - https://pubmed.ncbi.nlm.nih.gov/1554137/
ID  - 1554137
ER  -