Mass masking in the COVID-19 epidemic :   people need guidance / 
Chi Chiu Leung, Tai Hing Lam, Kar Keung Cheng 
 -  www.thelancet.com     Published online March 2, 2020. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coronavirus Infections--prevention and control<br/>Coronavirus Infections--transmissions<br/>Masks--supply and distribution<br/>World Health Organization
<br/><br/><label>Subjects--Index Terms: </label>COVID-19 Face Masks