中国科学技术信息研究所--国家工程技术数字图书馆

iowa state university.(5)

duke university.(4)

university of manitoba (canada).(4)

harvard university.(3)

state university of new york at buffalo.(3)

the university of alabama at birmingham.(3)

university of minnesota.(3)

university of toronto (canada).(3)

boston university.(2)

michigan state university.(2)

the george washington university.(2)

the johns hopkins university.(2)

the university of iowa.(2)

university of delaware.(2)

university of michigan.(2)

university of pennsylvania(2)

university of pennsylvania.(2)

university of pittsburgh.(2)

vanderbilt university(2)

virginia commonwealth university.(2)

yale university.(2)

albany college of pharmacy and health sciences.(1)

albert einstein college of medicine.(1)

boston university(1)

california institute of technology.(1)

case western reserve university (health sciences).(1)

college of medicine - mayo clinic(1)

columbia university.(1)

cornell university.(1)

dartmouth college.(1)