Katz, Joel2011-05-182011-05-181993Lancet, 342(8863), 65-66. (1993)http://hdl.handle.net/10315/7931enArticlehttp://www.thelancet.com/http://www.elsevier.comhttp://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6T1B-49JXPFR-3DC-2&_cdi=4886&_user=866177&_pii=014067369391279U&_origin=gateway&_coverDate=07%2F10%2F1993&_sk=996571136&view=c&wchp=dGLzVlz-zSkzV&md5=8f5d11cebc25fd046da0d0ee8f5936f5&ie=/sdarticle.pdf