David M Haas, Deborah M Caldwell, Page Kirkpatrick, Jennifer J McIntosh, Nicky J Welton
Haas D M, Caldwell D M, Kirkpatrick P, McIntosh J J, Welton N J.
Tocolytic therapy for preterm delivery: systematic review and network meta-analysis
BMJ 2012; 345 :e6226
doi:10.1136/bmj.e6226