Urinary excretion of N-nitrosamino acids and nitrate by inhabitants of high- and low-risk areas for esophageal cancer in Northern China: endogenous formation of nitrosoproline and its inhibition by vitamin C.
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M. Blettner | H. Bartsch | H. Ohshima | J. Wahrendorf | H. Fu | S. Lu | Y. Tian | F. Li | F. M. Li | F. Li | S. Lu