不过，他们也强调研究方法上存在不足，难以做出令人信服的结论。

However, they also stress that the studies had shortcomings in their methods that make it hard to draw firm conclusions.

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据一个市场研究公司Photizo集团所言，随着公司不断的寻找节省成本的方法，2009年全球打印管理服务市场增加27%达到258亿美元也就不足为奇了。

As companies look for ways to save money, it is not surprising that the global MPS market grew by 27% to $25.8 billion in 2009, according to Photizo Group, a market-research firm.

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然而，此项研究的不足之处是研究者曾经使用过普通的方法而不是具体的患者采取更敏感的条件。

However, a weakness in these studies is that the researchers have used general measures rather than more sensitive condition specific ones.

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