title: Research methodology: choices, logistics, and challenges.
authors: Rand Corporation, Santa Monica, CA 9040, USA.
authors: Ian D
authors: ID
authors: Coulter
authors: Primary Care and Population Sciences, University of Southampton, Southampton SO16, UK.
authors: George
authors: 0000-0002-2364-3960
authors: G
authors: Lewith
authors: Military Medical Research Program, Samueli Institute, Corona del Mar, CA 92625, USA ; Department of Planning, Policy, and Design, University of California, Irvine, CA 92617, USA.
authors: Raheleh
authors: 0000-0002-2947-079X
authors: R
authors: Khorsan
authors: School of Health Sciences, University of Canterbury, Christchurch 8140, New Zealand.
authors: Ray
authors: R
authors: Kirk
authors: Department of Veterans Affairs, VA Center for Implementation Practice and Research Support, Sepulveda, Greater Los Angeles, CA 91343, USA.
authors: Brian
authors: B
authors: Mittman