TY - CHAP T1 - Background to Sample Size Calculations T2 - Handbook of Statistical Methods for Randomized Controlled Trials PY - 2021/07/23 AU - Rothwell J AU - Cooper C AU - Julious S AU - Campbell M ED - DO - DOI: 10.1201/9781315119694-12 PB - Chapman and Hall/CRC SP - 243 EP - 274 Y2 - 2025/04/07 ER -