https://www.reuters.com/article/us-baidu-results/baidus-fourth-quarter-sales-goal-misses-estimates-as-regulation-trade-fears-bite-idUSKCN1N42QR >Chinese search engine operator Baidu Inc on Wednesday forecast fourth-quarter sales below analyst estimates, saying new regulations and uncertainty surrounding a Sino-U.S. trade spat has prompted clients to cut back on advertising.