For historical reasons, however, the Catholic Church has the Church of the Holy Sepulchre officially being the cathedral. In neo-Gothic style, the church has a floor plan of a Greek cross with a length of 28 meters and a width of 24 meters. The three-aisled church has an 8.5 metres wide nave, and the side aisles have a width of 4.5 metres; these are overbuilt with galleries. The church has four decorated stained glass windows, marking the ends of the cross. Three of them have the same shape: the window above the high altar represents the risen Christ as victor over death, the window on the left shows the Crucifixion, and the window on the right depicts the Adoration of the Magi. The rear window over the entrance is a large rose window and represents the Four Evangelists. The church has five altars, three in the nave and the two aisles and two smaller ones at the ends of the transept. The Diapason (magazine)  The Diapason is a magazine serving those who build and play organs. Content includes concert and recital announcements, information on building and maintaining organs and profiles of notable organists. As of July 2013, "The Diapason" reaches about 5,000 subscribers. The magazine was founded in 1909 by Siegfried E. Gruenstein. It is currently owned and published by Scranton Gillette Communications. GuLF Study  The GuLF Study, or Gulf Long-term Follow-up Study, is a five-year research project examining the human-health consequences of the "Deepwater Horizon" oil spill in April 2010. The spill followed an explosion on a drilling rig leased by BP, the British oil company, and led to the release of over four million barrels of oil into the Gulf of Mexico, 48 miles off the coast of Louisiana in the United States. The study was set up in June that year by the United States Department of Health and Human Services. It is being conducted by the National Institute of Environmental Health Sciences (NIEHS), part of the National Institutes of Health, and aims to recruit 55,000 of the 150,000 workers who volunteered or were employed to help clean up the spill. It is led by Dale Sandler, head of the NIEHS's epidemiology branch. The "Deepwater Horizon" oil spill was the world's largest accidental marine oil spill. It began on 20 April 2010 after an explosion on the "Deepwater Horizon", a drilling rig leased by BP to drill an exploratory well.