[No authors listed]
Nurs Times. 1992 Jul 29-Aug 4;88(31):3.
PMID: 1502074

Queen AN.
N Y State Dent J. 1985 Feb;51(2):80.
PMID: 3856786

Lewis IJ.
J Med Educ. 1974 Mar;49(3):312-3.
PMID: 4814372

Cockcroft B.
Br Dent J. 2006 Oct 21;201(8):489. doi: 10.1038/sj.bdj.4814165.
PMID: 17057658

Santora RQ.
Bull N Y Acad Med. 1983 Jul-Aug;59(6):550-3.
PMID: 6577923 Free PMC Article
Free PMC Article

May JM.
Bull N Y Acad Med. 1983 Jul-Aug;59(6):590-3.
PMID: 6577930 Free PMC Article
Free PMC Article

Bruce HW.
J Dent Educ. 1981 Oct;45(10):646-51.
PMID: 7024363