(د) حقوق الطفل في التعبير عن آرائه وفي أخذها بالاعتبار الواجب (المادة 12)
Since forms of primary, secondary and tertiary health care frequently overlap and often interact, the use of this typology does not always provide sufficient distinguishing criteria to be helpful for assessing which levels of health care States parties must provide, and is therefore of limited assistance in relation to the normative understanding of article 12.