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Hypovitaminosis D in Medical InpatientsThomas, Melissa K.; Lloyd-Jones, Donald M.; Thadhani, Ravi I.; Shaw, Albert C.; Deraska, Donald J.; Kitch, Barrett T.; Vamvakas, Eleftherios C.; Dick, Ian M.; Prince, Richard L.; Finkelstein, Joel S. · New England Journal of Medicine · 1998