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This is primarily due to operating expenses , portfolio diversification rules , and sampling errors when ETFs include just part of an index 's securities . " Although stopping smoking would prevent a large number of cases of head and neck cancer each year , this study indicates that a group of older patients would continue to develop the disease spontaneously , " says Wayne M. Koch , M.D ., the study 's lead author and associate professor of otolaryngology . " Chairman Kennard announced his recommendation to the Commission at an event sponsored by EdLiNC , a coalition of education and library organizations , and attended by telecommunications and computer industry representatives . While mutation of the p53 gene is the most common known genetic mutation in head and neck cancer , it is suspected that eight to 10 different mutations in this gene are required to develop this disease , Koch says . As you know , Mr. Speaker , the intent of the ` Gore Tax ' is to ensure that every school and library is connected to the Internet . Extra treats and holiday feasts can add up to quite a burden on a person 's nutritional conscience , " but people should n't let consuming a few extra calories over the holidays bother them too much , " according to Lawrence Cheskin , M.D ., director of Johns Hopkins ' Weight Management Center .