The terms used to identify the studies were: breast surgery [MeSH];, postoperative analgesia [MeSH];, postoperative chronic pain [MeSH];, paravertebral block [MeSH];, and preincisional paravertebral block [MeSH];.
Los términos usados para la obtención de los estudios fueron: breast surgery [Mesh], post operative analgesia [Mesh], post operative chronic pain [Mesh], paravertebral block [Mesh] y preincisional paravertebral block [Mesh].
Os termos usados para a obtenção dos estudos foram: breast surgery [Mesh], post operative analgesia [Mesh], post operative chronic pain [Mesh], paravertebral block [Mesh] e preincisional paravertebral block [Mesh].