External Validation of Prediction Models for Pneumonia in Primary Care Patients with Lower Respiratory Tract Infection: An Individual Patient Data Meta-Analysis.

Schierenberg A, Minnaard MC, Hopstaken RM, van de Pol AC, Broekhuizen BD, de Wit NJ, Reitsma JB, van Vugt SF, Graffelman AW, Melbye H, Rainer TH, Steurer J, Holm A, Gonzales R, Dinant GJ, de Groot JA, Verheij TJ