Commentary: like it and lump it? Meta-analysis using individual participant data.

Perry MBChB, University of Cambridge, UK; KK Ray MD, University of Cambridge, UK; N Sarwar PhD, University of Cambridge, UK; M Alexander MPhil, University of Cambridge, UK; A Thompson PhD, University of Cambridge, UK; SG Thompson DSc, MRC Biostatistics Unit, UK; M Walker PhD, University of Cambridge, UK; S Watson MMath, University of Cambridge, UK; F Wensley MSc, University of Cambridge, UK; IR White MSc, MRC Biostatistics Unit, UK; AM Wood PhD, University of Cambridge, UK; J Danesh FRCP, University of Cambridge, UK (principal investigator).