BEIJING: A travel ban imposed on a US Wells Fargo employee has raised fresh concerns among foreign firms about the risks of doing business in China, amid growing scrutiny of international companies and renewed fears of entanglement with Chinese authorities. The bank has suspended all staff travel to China after Shanghai-born Chenyue Mao, who leads its international factoring division, was blocked from leaving the country in recent weeks, according to the Wall Street Journal . Mao is a US