2.5 Data extraction
Two authors (J Jiang and D Zhang) independently extracted data and
cross-checked, disagreements were resolved with the help of W Zhang. The
extracted contents included: (a) Basic research information: first
author and publication year; (b) Study characteristics: patient age,
sample size, intervention measures, intervention site, treatment
frequency and treatment time. (c) Outcome measures were as follows:
6MWT, PAQLQ, FEF25-75% pred, FEV1% pred and FVC%
pred.