结论：国产与进口舍雷肽酶肠溶片治疗痰液黏稠均安全、有效。
CONCLUSION: The domestic serrapeptase is an effective and safe expectorant as well as imported.
方法：用前瞻性随机双盲双模拟对照多中心试验设计，以进口舍雷肽酶肠溶片为阳性对照药。
METHODS: A prospective multi-center, randomized , double blind, controlled clinical trial of serrapeptase enteric-coated tablets was conducted.
方法：用前瞻性随机双盲双模拟对照多中心试验设计，以进口舍雷肽酶肠溶片为阳性对照药。
METHODS: A prospective multi-center, randomized , double blind, controlled clinical trial of serrapeptase enteric-coated tablets was conducted.
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