Who is in the calendar?

Every month the life and work of another amazing medic is described:


January:        David Livingstone
February:      John Hunter
March:           Ferdinand Franz Wallraf
April:               Joseph Lister
May:              Robert Koch
June:             William Harvey
July:              Elisabeth von Thüringen
August:         Florence Nightingale
September:   Heinrich Hoffmann
October:        Alfred Döblin
November:    Johann Andreas Eisenbarth
December:    Robert Knox