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"Currently, passenger load factors on most flights are not high. This is an innovative value-added product. Passengers will feel more comfortable and carriers can increase revenue by selling extra seats to the same passenger," said Lin, who is also a columnist at Carnoc.com, one of China's biggest civil aviation websites.

"Cortisol affects many different functions so it is important to fully investigate how high levels of the hormone may affect the brain," said the study's author Justin B. Echouffo-Tcheugui with Harvard Medical School.

"Countries are understandably eager to open up their societies and their economies. But the virus is still spreading fast. It is still deadly and most people are still susceptible," he said.

"Compared with doctors for people, veterinarians need to treat different kinds of animals and a wide variety of diseases," Xiong said. "To some extent, they must have more professional knowledge and need more practice."

"Chinese consumers have become increasingly willing to pay for better services in the past one to two years," said Chen Zhiyu, senior vicepresident of Sam's Club China. He predicted that the membership model would enter a phase of explosive growth in the years to come.