An investor looks at an electronic board showing stock information at a brokerage house in Shanghai, China July 6, 2018. REUTERS/Aly Song SHANGHAI, Aug 11 (Reuters) - A growing number of healthcare companies in China are shelving their initial public offering (IPO) plans as its stock exchanges have stepped up scrutiny of the pharmaceutical industry's business practices amid an escalating anti-corruption drive. Healthcare stocks have already slumped in China since the government in late July launched a year-long anti-graft campaign, targeting what it said was the rampant practice of bribing of doctors in drug and medical equipment sales. Pharmaceuticals is...