Comparison of up-front cash cards and checks as incentives for participation in a clinician survey: a study within a trial oleh Lydia E. Pace, Yeonsoo S. Lee, Nadine Tung, Jada G. Hamilton, Camila Gabriel, Sahitya C. Raja, Colby Jenkins, Anthony Braswell, Susan M. Domchek, Heather Symecko, Kelsey Spielman, Beth Y. Karlan, Jenny Lester, Daniella Kamara, Jeffrey Levin, Kelly Morgan, Kenneth Offit, Judy Garber, Nancy L. Keating