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Duration of breast-feeding patterns established in the hospital. Influencing factors. Results from a national survey.
Ryan AS, Wysong JL, Martinez GA, Simon SD. Ryan AS, et al. Among authors: wysong jl. Clin Pediatr (Phila). 1990 Feb;29(2):99-107. doi: 10.1177/000992289002900207. Clin Pediatr (Phila). 1990. PMID: 2302909
Dietary patterns of older adults in the United States, NHANES II 1976-1980.
Ryan AS, Martinez GA, Wysong JL, Davis MA. Ryan AS, et al. Among authors: wysong jl. Am J Hum Biol. 1989;1(3):321-330. doi: 10.1002/ajhb.1310010312. Am J Hum Biol. 1989. PMID: 28514088
A comparison of breast-feeding data from the National Surveys of Family Growth and the Ross Laboratories Mothers Surveys.
Ryan AS, Pratt WF, Wysong JL, Lewandowski G, McNally JW, Krieger FW. Ryan AS, et al. Among authors: wysong jl. Am J Public Health. 1991 Aug;81(8):1049-52. doi: 10.2105/ajph.81.8.1049. Am J Public Health. 1991. PMID: 1853999 Free PMC article.