TY - JOUR AU - Belafsky, P C; Postma, G N; Koufman, J A TI - Validity and reliability of the reflux symptom index (RSI) JO - J Voice VL - 16 PY - 2002 DO - 10.1016/S0892-1997(02)00097-8 SP - 274 EP - 277 ER -