* participants will be excluded if they have one or more of the followings: 1) inability to communicate (e.g. cognitive impairment); 2) history of chinese medicine allergies; 3) incompetent in giving consent.

* participants will be excluded if they have one or more of the followings: 1) inability to communicate (e.g. cognitive impairment); 2) history of chinese medicine allergies; 3) incompetent in giving consent.

- participants will be excluded if they have one or more of the followings: 1) inability to communicate (e.g. cognitive impairment); 2) history of chinese medicine allergies; 3) incompetent in giving consent.

- participants will be excluded if they have one or more of the followings: 1) inability to communicate (e.g. cognitive impairment); 2) history of chinese medicine allergies; 3) incompetent in giving consent.