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 – a must read for all clinical researchers.
Addendum 26 Feb 2021
Sorry for the title that involuntarily replicated a title from paper published already 14 years before https://pubmed.ncbi.nlm.nih.gov/7647644/