Skin Therapy Letter © (ISSN 1201–5989) Copyright 2019 by SkinCareGuide.com Ltd. 
Skin Therapy Letter © is published 6 times annually by SkinCareGuide.com Ltd, 
1003 - 1166 Alberni Street, Vancouver, British Columbia, Canada, V6E 3Z3. All 
rights reserved. Reproduction in whole or in part by any process is strictly 
forbidden without prior consent of the publisher in writing. While every effort 
is made to see that no inaccurate or misleading data, opinion, or statement 
appears in the Skin Therapy Letter ©, the Publishers and Editorial Board wish to 
make it clear that the data and opinions appearing in the articles herein are 
the responsibility of the contributor. Accordingly, the Publishers, the 
Editorial Committee and their respective employees, officers, and agents accept 
no liability whatsoever for the consequences of any such inaccurate or 
misleading data, opinion, or statement. While every effort is made to ensure 
that drug doses and other quantities are presented accurately, readers are 
advised that new methods and techniques involving drug usage, and described 
herein, should only be followed in conjunction with the drug manufacturer’s own 
published literature.