TY - CONF T1 - Estimating the underlying overall and centre recruitment rates in external pilot trials-how many centre-months of recruitment data do we need? A case study of the BEADS pilot trial JO - TRIALS PY - 2017/05/08 AU - Mandefield L AU - Walters S AU - Team BEADST ED - VL - 18 Y2 - 2025/03/11 ER -