[Soviet Union--snowball effect].
Kjaergaard
G
G
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control; D003428:Cross Infection / Q000517:prevention & control*; D003718:Denmark / Q000208:ethnology; D004509:Education, Nursing, Continuing; D006509:Hepatitis B / Q000517:prevention & control; D006801:Humans; D014586:USSR
Sovjetunionen--sneboldeffekt.