TY - JOUR T1 - What can qualitative research do for randomised controlled trials? A systematic mapping review JO - Trials PY - 2013/11/01 AU - O'Cathain A AU - Thomas K AU - Drabble S AU - Rudolph A AU - Hewison J ED - DO - DOI: 10.1186/1745-6215-14-s1-o52 PB - Springer Science and Business Media LLC VL - 14 IS - S1 Y2 - 2025/07/12 ER -