Dear Heather, neat site! Article is 1998 Nov. Lucas et al in BMJ. Next question: I downloaded full text (took 2 min). Where did it go in my computer? How can I print it out? Oh I am so pathetic. But this would be so much easier than trudging to the library! Oh you mighty computer experts, please enlighten me (in easy to understand steps, please). Sincerely, Pat in SNJ