TY - JOUR T1 - Modeling Health State Utility Values in Ankylosing Spondylitis: Comparisons of Direct and Indirect Methods JO - Value in Health PY - 2015/06/01 AU - Wailoo A AU - Hernández M AU - Philips C AU - Brophy S AU - Siebert S ED - DO - DOI: 10.1016/j.jval.2015.02.016 PB - Elsevier BV VL - 18 IS - 4 SP - 425 EP - 431 Y2 - 2024/12/22 ER -