1. Christensen CM (1997) The innovator’s dilemma: when new technologies cause great firms to fail. Harvard Business School Press, Boston, Massachusetts, USA, S 7–19
2. Meyers MA (2011) Happy accidents: serendipity in major medical breakthroughs in the twentieth century. Arcade Publishing, New York
3. Sackett DL, Rosenberg WM, Gray JA, Haynes RB, Richardson WS (1996) Evidence based medicine: what it is and what it isn’t. BMJ 312(7023):71–72
4. Cochrane AL (1972) Effectiveness and efficiency. Random reflections on health services. Nuffield Provincial Hospitals Trust, London (Reprinted in 1989 in association with the BMJ, Reprinted in 1999 for Nuffield Trust by the Royal Society of Medicine Press, London)
5. Nissen R (1956) Eine einfache Operation zur Beeinflussung der Refluxösophagitis. Schweiz Med Wochenschr 86(Suppl 20):590–592