Hi everyone! My name is YongMoon Lee, a professor working with LC-MS/MS analysis at College of Pharmacy, Chungbuk National University in South Korea. I am leading a research project for pharmaceutical analysis, especially genotoxic impurities such as NDMA. I read the ICH M7(R2) Q&A that should provide clearer explanation about the M7 Guideline. But, I still have a few question to know more.