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. 2015 May 2;5(4):e007385. doi: 10.1136/bmjopen-2014-007385

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(A) The proximity of the limestone layer to the surface of the earth in Northern Europe with special focus on Denmark. (B) The frequency (2000–2010) of hospital-admitted sialolithiasis with respect to the age of the patient at the time of diagnosis. (C) The incidence (number of cases per 100 000 citizens per year) of hospital-admitted sialolithiasis in the 98 Danish municipalities and (D) the drinking water calcium levels (mg/L) in each of the municipalities. (C and D) Mean values (2000–2010) for each of the municipalities. For magnesium and hydrogen carbonate, the map covering the land of Denmark would be very similar to (D) for calcium.