Table 6.

The occurrence of dosage.

Dosage	Occurrence	Reference
1–15 g/d (10)	10	Gao and Huang [24]
16–30 g/d (8)	8	Hou et al. [58]
31–50 g/d (16)	16	Zhang et al. [59]
More than 50 g/d (11)	11	Wang and Cai [60]