TY - JOUR T1 - Response to Letter Regarding Article, "The Effects of Vitamin D Supplementation on Physical Function and Quality of Life in Older Heart Failure Patients: A Randomized Controlled Trial" A1 - Witham,Miles D. A1 - Crighton,Linda J. A1 - Gillespie,Neil D. A1 - Struthers,Allan D. A1 - McMurdo,Marion E. T. AU - Witham,Miles D. AU - Crighton,Linda J. AU - Gillespie,Neil D. AU - Struthers,Allan D. AU - McMurdo,Marion E. T. PY - 2010/7 Y1 - 2010/7 U2 - 10.1161/CIRCHEARTFAILURE.110.954677 DO - 10.1161/CIRCHEARTFAILURE.110.954677 M1 - Letter JO - Circulation: Heart Failure JF - Circulation: Heart Failure SN - 1941-3289 IS - 4 VL - 3 SP - E25-E25 ER -