Is qualitative social research in global health fulfilling its potential?: a systematic evidence mapping of research on point-of-care testing in low- and middle-income contexts oleh Janet Perkins, Sarah Nelson, Emma Birley, Emilie Mcswiggan, Marshall Dozier, Anna McCarthy, Nadege Atkins, Eldad Agyei-Manu, Jasmin Rostron, Koichi Kameda, Ann Kelly, Clare Chandler, Alice Street