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There is very limited data on the epidemiological features of these diseases in the literature. The low incidence of these diseases and the difficulty in their diagnosis are the main obstacles in evaluating the epidemiological properties of these diseases. The incidence ratio has been reported to be between 3.6 and 32/100?000 in earlier studies [1-5]. The most frequent diseases in this group are sarcoidosis and idiopathic pulmonary fibrosis (IPF), followed by connective tissue diseases (CTD) and hypersensitivity pneumonitis in some studies. Unfortunately, studies on this subject suffer from limited number of patients, and there are significant differences in the results across different countries. The aim of this study was to evaluate the epidemiological features and the distribution of ILD in Turkey and to find out the annual incidence of the disease. This study was led by the Turkish [https://en.wikipedia.org/wiki/Amiloride Amiloride] Thoracic Society (TTS) Clinical Problems Study Group in Turkey. This was announced to all members of the TTS. Investigators accepting contribution to the [http://www.selleckchem.com/products/INCB18424.html Ruxolitinib] study were sent via Internet work protocols and case registration forms. The newly diagnosed cases were collected through Internet transfer of electronic case registration forms. In order to achieve a high attendance and a good response, the form was kept simple. Demographic data, the diagnostic tool used for the exact diagnosis of ILD such as HRCT, BAL, TBB or surgical lung biopsy and the type of ILD were asked to register. In every participating centre, a chest physician expert on ILD was responsible to identity the patients according to the current American Thoracic Society/European Respiratory Society (ATS/ERS) international consensus classification. Fifty-four researchers from 31 centres in 19 different cities spread across six geographical regions of Turkey participated in the study. The cities sampled in this study were highlighted on the map of Turkey in Fig.?1. Newly diagnosed patients between 1 June 2007 and 31 May 2009 enrolled in the study. ILD was classified according to the ATS/ERS guideline of 2002. Ethics approval was not obtained because this was a survey. But the study was performed according to the principles of the Helsinki Declaration. The study protocol [http://www.selleckchem.com/products/PLX-4032.html Raf inhibitor] was approved by the executive committee of the TTS Clinical Problems Group. All of the patients gave their permission that data from their medical records would be used in the study. To ensure confidentiality of patient's name, the initials were used in the electronic case records forms. Only 21 centres in nine cities, which provided the regular data, were included in incidence calculations. Statistical analysis was carried out by IBM SPSS 21 program package (2029 Stierlin Court Mountain View, CA 94043 USA). Data were presented as percentage or mean?��?standard deviation (SD) as appropriate. Groups were compared using chi-square, student's t-tests; P values of