Appendix 2 to Questions and answers for marketing authorisation holders/applicants on the CHMP Opinion for the Article 5(3) of Regulation (EC) No 726/2004 referral on nitrosamine impurities in human medicinal products(附录2向营销授权持有人/申请人提出问题和答案，《法规》第5条第3款（EC）第726/2004条第726/2004条的硝基胺杂质转诊)