This study aims to explore the clinical characteristics and risk factors of rheumatoid arthritis (RA)-associated interstitial lung disease (ILD). This is a retrospective study of 550 patients with RA. All patients underwent chest high-resolution computed tomography (HRCT) scanning. (1) Two hundred thirty-seven out of five hundred fifty (43.1%) patients with RA were diagnose with ILD. 13.5% ILD occurred before RA onset, 69.6% ILD occurred within 10 years of RA onset, and 16.9% ILD occurred more than 10 years after RA onset. (2) The most common chest CT characteristics of RA-ILD included reticular patterns (57.8%), pleural thickening (57%), ground-glass attenuation (53.2%), followed by interlobular septum thickening, nodules, emphysematous bullae, honeycombing, and bronchiectasis. The proportion of the UIP pattern and NSIP on HRCT was 18.6% and 57.8%. (3) RA-ILD was often associated with other lung lesions, including pleural disease, bronchiectasis, and pulmonary hypertension. (4) the comparisons between RA with ILD and RA without ILD showed that male, smoking, age, disease duration, number of swelling joints, globulin levels, erythrocyte sedimentation rate, C-reactive protein levels, lactate dehydrogenase, the positive rate of rheumatoid factor (RF) and the absolute value of RF, forced vital capacity, forced expiratory volume in 1 s, and carbon monoxide diffusion rate, were statistically different (P < 0.05). Logistic regression analysis showed that age, smoking, elevated lactate dehydrogenase, and RF positive were closely correlated to RA-ILD. RA-ILD occurs more often within 10 years of RA onset and coexists with other lung lesions. The elevated lactate dehydrogenase, RF positive, smoking, and advanced age are closely correlated with RA-ILD.

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During China's rapid urbanization, its megacities are facing the greatest challenge of urban growth control of both population and built-up area. As one of the most important measures of urban containment, Green Belt has been widely used worldwide for many years. Beijing's Green Belts have been in their implementation for nearly three decades, during which different implementation approaches were used. The article looks into the evolution of Beijing's Green Belts policies and the existing implementation approaches, in which, the government, rural collectives and property developers cooperate in different ways. The aim of the article is to provide China's megacities with experience and lessons of urban containment policy implementation. In-depth interview, document research, remote sensing and GIS analysis are used for summarizing the detailed processes of different implementation approaches, as well as their strengths and problems. Four approaches involved include 'government direct participation -property developer nonintervention', 'government direct participation -property developer intervention', 'government nonparticipation -property developer intervention' and 'government indirect participation -property developer intervention'. Typical areas in the unit of the township are selected to analyze and compare the effectiveness of Green Belts policy under different implementation approaches. The conclusion is that the implementation approach of 'government direct participation -property developer nonintervention' results in the greatest effectiveness of physical environmental plan implementation, but requires large amounts of financial expenditure, and thus cannot be widely used. The approaches of 'property developer intervention' suit market-oriented economy better, and thus are more widely used, but they have also left some unsolved problems caused by market failure such as the under-supply of public goods. Suggestions for Proceedings of the 8th Conf. Int. Forum Urban. C006planning policy improvement lie in how to guide these four approaches respectively to achieve the multiple goals more effectively during Beijing's Green Belts implementation.

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