Fig. 2From: Chinese herbal medicine for constipation: zheng-based associations among herbs, formulae, proprietary medicines, and herb–drug interactionsNetwork relationship of Chinese herbal medicine in the treatment of constipation. Red and green nodes represent different single herbal medicines. The edges represent co-occurrence frequency in clinical studies. The edge label numbers represent the number of clinical studies demonstrating a connection between two single herbal medicinesBack to article page