Uhl J.
UNA Commun. 1978 Nov-Dec;5(1):11-2.
PMID: 310187

Drèze J.
Natl Med J India. 1999 Jan-Feb;12(1):2-5.
PMID: 10326321

Hiddlestone HJ.
N Z Nurs J. 1975 Apr;68(4):22-3.
PMID: 1055333

Manzie PP.
Med J Aust. 1979 Jun 30;1(13):601-2. doi: 10.5694/j.1326-5377.1979.tb119392.x.
PMID: 492003

Chao LM, Gong YL, Gu SJ.
Am J Public Health. 1982 Sep;72(9):78-80. doi: 10.2105/ajph.72.9_suppl.78.
PMID: 7102881 Free PMC Article
Free PMC Article