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Organisation of the TAPHE study illustrating constituent data elements included within component studies. Colours are indicative of data elements that were grouped together in SOPs or study protocols. ANC, antenatal care; ARI, acute respiratory illness; BW, birth weight; ETS, environmental tobacco smoke; M-C, mother–child; PHC, Primary Health Care Centre; PM2.5, particulate matter; TAPHE, The Tamil Nadu Air Pollution and Health Effects; UHP, Urban health post.
