"north america": mit, stanford university, yale university, university of chicago, columbia university, university of california berkeley, university of pennsylvania, johns hopkins university, new york university, uiuc, duke university, washington university in st louis, cornell university, carnegie mellon university, uc san diego, university of washington, university of wisconsin-madison, northwestern university, university of michigan-ann arbor, university of california-los angeles, university of texas at austin, georgia institute of technology, uc santa barbara, university of toronto, university of waterloo