Human-centered implementation research: a new approach to develop and evaluate implementation strategies for strengthening referral networks for hypertension in western Kenya oleh Mc Kinsey M. Pillsbury, Eunice Mwangi, Josephine Andesia, Benson Njuguna, Gerald S. Bloomfield, Agneta Chepchumba, Jemima Kamano, Tim Mercer, Juliet Miheso, Sonak D. Pastakia, Shravani Pathak, Aarti Thakkar, Violet Naanyu, Constantine Akwanalo, Rajesh Vedanthan