For years, foreign healthcare providers have moved cautiously in China, mainly offering Western-style medicine to expatriates and rich Chinese. But now some Taiwan companies are taking a radically different tack and selling low-cost quality healthcare to China's masses. The move is risky because China's healthcare market is fragmented and largely insulated from criticism because the state runs most of it. But the companies have an interesting edge because they are Taiwan manufacturing giants that have been running low-cost factories in China for years.