SALLIS, JAMES F.; SIMONS-MORTON, BRUCE G.; STONE, ELAINE J.; CORBIN, CHARLES B.; EPSTEIN, LEONARD H.; FAUCETTE, NELL; IANNOTTI, RONALD J.; KILLEN, JOEL D.; KLESGES, ROBERT C.; PETRAY, CLAYRE K.; ROWLAND, THOMAS W.; TAYLOR, WENDELL C. 作者信息
Sallis等人（1996年）研究了这个问题。
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