6Department of Health and Human Services, Centers {or MedicareMedicaid servicesEZ. Fed Register, 2003 : 3704.
7National Committee for Clinical Laboratory Standards. EP6-A E valuation of the linearity of quantitative measurement procedures a statistical approach. Approved GuidelineES. Wayne, PA, USA NCCLS,2003.
8Hopper MK. Assessment and comparison of student engagement in a variety of physiology courses [J]. Adv Physiol Educ, 2016, 40:70- 78.