Aristolochia serpentaria (Virginia snakeroot), Aristolochia reticulata (Texas snakeroot) and in Chinese herbs such as Aristolochia fangchi and Aristolochia mandshurensis (banned in China and withdrawn from Chinese Pharmacopoea 2005; Stephania tetrandra and Magnolia officinalis do not contain aristolochic acid).
age-based rationing. Age-Based Rationing. A proposed form of rationing publicly-funded health care services, in which limits would be placed on the type and amount of such services that would be freely available to persons above a certain age.
The teacher-to-child ratio for school-aged children is 1:14; one teacher and one aide may supervise up to 28 children. In mixed-age groups, the number of staff must accommodate the age of the youngest child. Infant programs require a ratio of 1:4, with a maximum group size of 12 children.