乳腺癌患者参与了1991年开始在加利福利亚的三个地点进行的这项研究，并受到连续十年的追踪随访。
Breast cancer patients took part in the study at three sites in Northern California beginning in 1991, and were tracked for up to a decade.
为帮助解决问题，全国癌症协会的研究人员询问490，802名美国退休人员协会的成员有关他们通常的饮食习惯，并随访追踪五年；
To help settle the issue, National Cancer Institute researchers asked 490,802 AARP members about their typical dietary habits and then followed them for five years.
方法：采用追踪调查方法观察了48名特发性生长激素缺乏症病人，经十年远期身高随访。
Methods: To observe the height of 48 children with idiopathic growth hormone deficiency by tracing method in ten years.
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