TY - CONF T1 - When to do an external or internal pilot study : findings from an interview study with research funders JO - Trials UR - http://eprints.whiterose.ac.uk/153657/ PY - 2019/10/22 AU - Fairhurst K AU - Avery K AU - O'Cathain A AU - Hoddinott P AU - Blazeby J ED - DO - DOI: 10.1186/s13063-019-3688-6 PB - BioMed Central VL - 20 IS - Supplement 1 SP - 112 EP - 112 Y2 - 2024/09/20 ER -