方法：数据通过问卷、电话访问和医学记录的方式收集。
METHODS: Data were collected via questionnaires, phone interviews and medical records.
这种访问方式与众不同处在于他提供记录级别的锁。当程序需要并发的访问队列时，这一点可以提高性能。
This access method is unusual in that it provides record level locking. This can provide beneficial performance improvements in applications requiring concurrent access to the queue.
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