Fig. 1. Sampling scheme and data management for Internet-based survey of U.S. anesthesiologists, aged 50–79 yr, using the American Society of Anesthesiologists’ (ASA) membership database.
Fig. 1. Sampling scheme and data management for Internet-based survey of U.S. anesthesiologists, aged 50–79 yr, using the American Society of Anesthesiologists’ (ASA) membership database.
