Researchers in the U.S. have said that mask-wearing should not be used as a substitute for social distancing. Although mask-wearing was shown to reduce transmission of COVID-19, it was not the most effective. Areas where people wore face masks while social distancing showed the highest chance of controlling transmission. The wearing of a face mask was seen by many as enough to combat the spread of the virus, but this is not the case. An important finding of this research is that mask-wearing is not a replacement for physical distancing, Ben Rader of Boston University. The research was done by analytics firm Elsevier and published in the journal, Lancet Digital Health. The results of the study match the WHO recommendation of mask usage in conjunction with other measures. Other measures include hand washing, increased ventilation, and people avoiding touching their faces and mouths.