Links
[1] https://www.ctsnet.org/user/login?destination=user/420670
[2] https://www.ctsnet.org/print/home/tsadler
[3] https://www.ctsnet.org/article/pioneers-cardiac-surgery-clarence-crafoord
[4] https://www.ctsnet.org/articles/tsadler
[5] https://www.ctsnet.org/society/ctsnet
[6] https://www.ctsnet.org/society/sts