Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40001-020-00423-4/MediaObjects/40001_2020_423_Fig3_HTML.png)
Hermann Otto Hoyer (1894–1968) 1922 Sauerbruch in a thoracotomy, Museum of Medical History at the Charité, art collection Charité, picture Bruns Inv.-Nr. 123330 Repro Moll-Keyn, with kind permission
Hermann Otto Hoyer (1894–1968) 1922 Sauerbruch in a thoracotomy, Museum of Medical History at the Charité, art collection Charité, picture Bruns Inv.-Nr. 123330 Repro Moll-Keyn, with kind permission