[A case control study of lumbar fusion surgery with the Wiltse approach and the traditional approach].

Objective: To compare the clinical results between the Wiltse approach and traditional approach in lumbar fusion.

Methods: The clinical data of 70 patients with lumbar disc herniation or lumbar spondylolisthesis within Meyerding II degree who underwent lumbar fusion surgery from May 2016 to May 2017 were retrospectively analyzed. According to the surgical approach, the patients were divided into Wiltse approach group and traditional approach group.

[A study on the methodology regarding the prevalence survey of chronic obstructive pulmonary disease in China].

Objective: To explore the methodology on prevalence study of chronic obstructive pulmonary disease (COPD) in line with the world, to obtain accurate epidemic data of COPD in China.

Methods: A national multi-center cross-sectional survey on prevalence, risk factors and burden of COPD was conducted in China. In each area, a population-based cluster sample of approximately 1450 individuals aged 40 years or older was interviewed, using standardized questionnaires that were revised on the methodology of burden of lung diseases (BOLD) study and according under the context of China.