A total of 24 volunteers who took part in the study were given strict instructions on oral hygiene, diet and medication intake.
共有24名志愿者参与了这项研究，研究者们在口腔卫生、饮食和药物服用等方面对他们提出了严格的要求。
A total of 24 volunteers who took part in the the study were given strict instructions on oral hygiene, diet and medication intake.
共有24名志愿者参与了这项研究，研究者们在口腔卫生、饮食和药物服用等方面对他们提出了严格的要求。
A total of 24 volunteers who took part in the the study were given strict instructions on oral hygiene, diet and medication intake.
共有24名志愿者参与了这项研究，研究者们在口腔卫生、饮食和药物服用等方面对他们提出了严格的要求。
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