PPI到底用了4-8周还是两个月？

Upper GI endoscopy (Fig. E2) is useful to document the type and extent of tissue damage in persistent GERD and to exclude eosinophilic esophagitis and potentially malignant conditions such as Barrett esophagus. The American College of Physicians recommends endoscopy in the setting of GERD in people with heartburn and alarm symptoms (dysphagia, bleeding, anemia, weight loss, and recurrent vomiting). It is also indicated in people with GERD symptoms that persist despite a therapeutic trial of 4 to 8 wk of bid proton pump inhibitor (PPI) therapy in patients with severe erosive esophagus after a 2-mo course of PPI therapy to assess healing and rule out Barrett esophagus.

l 上消化道内窥镜检查（图.E2）有助于记录持续性GERD的组织损害的类型和程度，并排除嗜酸性食管炎和潜在的恶性疾病（如Barrett食道）。美国医师学会建议有胃灼热和报警症状（吞咽困难、出血、贫血、体重减轻和反复呕吐）的患者进行胃肠镜检查。对那些经过了两个月的质子泵抑制剂（proton pump inhibitor，PPI）治疗的严重食道侵蚀的同时又进行了4到8周的一天两次的PPI尝试治疗的GERD仍有症状的患者也应做上消化道内窥镜检查，以评估愈合情况并排除Barrett食道。

胃酸返流治疗了6-8周，严重食道侵蚀治疗了2个月?难道这两个症状是分开来治疗的？如果不是分开治疗的，两个月就已经包括4-8周了？