fix coherence mistakes in the following paragraph:
Individual Aconitum species vary somewhat in the degree of their toxicity. All are poisonous and, when used in traditional herbal medicine, are invariably pre-treated in various ways intended to minimise their toxicity, while retaining their assumed therapeutic properties.
Although individual Aconitum species vary somewhat in the degree of their toxicity, all are poisonous and, when used in traditional herbal medicine, are invariably pre-treated in various ways intended to minimise their toxicity, while retaining their assumed therapeutic properties.