Six months earlier, he developed traveler's diarrhea while vacationing in Mexico. On physical examination, he is afebrile and has an unremarkable abdominal examination. On examination of the perianal area, there is a group of five ...
fatty fish, vitamin d–fortified reduced-fat dairy products, regular supplement use, and taking a sun vacation are important predictors for serum concentrations of 25(oh)d during winter at a latitude of 60'
