by Klein, J.D, Starnes, S.A, Kotelchuck, M, DeFriese, G.H, Loda, R.A, Earp, J.A
Published in The Journal of school health (01.11.1993)

by DeFriese, G.H, Klein, J.D, Earp, J.A, Loda, F.A, Starnes, S.A
Published in MMWR. Morbidity and mortality weekly report (09.07.1993)