Absence of evidence is not evidence of absence

I have just discovered that the book of Helmut Kiene”Komplementäre Methodenlehre der klinischen Forschung. Cognition-based Medicine. Berlin – Heidelberg – New York: Springer; 2001, 193 S. ISBN 3-540-41022-8 is now being online available as PDF – great, a must read for all clinical researchers.