Medical Matrix Search Engine switched to subscription: as stated in an e-mail sent in April to users: "It has been our mission to deliver the timely, credible information you need. To continue to provide you with this information, effective May 1, 2002, the Medical Matrix Search Engine will be available on a subscription basis. [...] For only $71 a year, you will receive unlimited access to the most powerful medical search engine on the Web. Or, if you prefer, you can subscribe for only $14 a month. For our institutional members, including medical libraries, a one-year subscription (includes 5 concurrent users) is available for only $199."

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