See ISPE Guidelines 5.20. The EPO applies option ISPE Guidelines A5.20[2] of the Appendix to Chapter 5 of the ISPE Guidelines.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/f_iv_4_2.htm
Date retrieved: 17 May 2021
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/f_iv_4_2.htm
Date retrieved: 17 May 2021