中国科学技术信息研究所--国家工程技术数字图书馆

harvard university.(27)

the johns hopkins university.(21)

walden university.(12)

columbia university.(11)

university of washington.(11)

georgetown university.(10)

tulane university.(10)

university of notre dame.(10)

the university of north carolina at chapel hill.(9)

university of south florida.(9)

yale university.(9)

university of south florida(8)

yeshiva university.(8)

university of california los angeles.(7)

university of california san francisco.(7)

university of maryland baltimore.(7)

duke university.(6)

georgetown university(6)

harvard university(6)

the johns hopkins university(6)

the university of iowa.(6)

university of california davis.(6)

university of notre dame(6)

university of toronto (canada).(6)

university of washington(6)

washington university in st. louis.(6)

drexel university college of medicine.(5)

new york university.(5)

princeton university.(5)

the university of texas health science center at san antonio.(5)