Sex ratio associated with timing of insemination and length of the follicular phase in planned and unplanned pregnancies during use of natural family planning von Gray, R H, Simpson, J L, Bitto, A C, Queenan, J T, Li, C, Kambic, R T, Perez, A, Mena, P, Barbato, M, Stevenson, W, Jennings, V

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Adverse outcomes of planned and unplanned pregnancies among users of natural family planning: a prospective study von Bitto, A, Gray, R H, Simpson, J L, Queenan, J T, Kambic, R T, Perez, A, Mena, P, Barbato, M, Li, C, Jennings, V

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Timing of conception and the risk of spontaneous abortion among pregnancies occurring during the use of natural family planning von Gray, Ronald H., Simpson, Joe L., Kambic, Robert T., Queenan, John T., Mena, Patricio, Perez, Alfredo, Barbato, Michele

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Natural family planning use-effectiveness and continuation von Kambic, Robert T.

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Calendar rhythm efficacy : a review von KAMBIC, R. T, LAMPRECHT, V

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Further evidence that infection is an infrequent cause of first trimester spontaneous abortion von SIMPSON, J. L, GRAY, R. H, JENNINGS, V, QUEENAN, J. T, BARBATO, M, PEREZ, A, MENA, P, KAMBIC, R. T, PARDO, F, STEVENSON, W, LI, C

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Roman catholic church-sponsored natural family planning services in the United States von KAMBIC, R. T, NOTARE, T

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Factors related to autonomy and discontinuation of use of natural family planning for women in Liberia and Zambia von Kambic, Robert T., Gray, Ronald H.

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Trial of a new method of natural family planning in Liberia von KAMBIC, R. T, LANCTOT, C. A, WESLEY, R

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Fetal outcome among pregnancies in natural family planning acceptors: An international cohort study von Simpson, Joe Leigh, Gray, Ronald H., Queenan, John T., Kambic, Robert T., Pérez, Alfredo, Mena, Patricio, Barbato, Michele, Pardo, Francisco, Tagliabue, Guillermo, Bitto, Adenike, Stevenson, Wilma

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Epidemiological studies of natural family planning von Gray, R H, Kambic, R T

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Gender Preselection von Kambic, Robert T., Gray, Ronald H.

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Evaluating client autonomy in natural family planning von KAMBIC, R. T, MARTIN, M. C

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Effects of timing of conception on birth weight and preterm delivery of natural family planning users von Barbato, M, Bitto, A, Gray, R H, Simpson, J L, Queenan, J T, Kambic, R T, Perez, A, Mena, P, Pardo, F, Stevenson, W, Tagliabue, G, Jennings, V, Li, C

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Pregnancy complications in natural family planning users von Mena, P, Bitto, A, Barbato, M, Perez, A, Gray, R H, Simpson, J L, Queenan, J T, Kambic, R T, Pardo, F, Stevenson, W, Tagliabue, G, Jennings, V, Li, C

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Pregnancy outcome in natural family planning users: cohort and case-control studies evaluating safety von Simpson, J L, Gray, R H, Perez, A, Mena, P, Barbato, M, Castilla, E E, Kambic, R T, Pardo, F, Tagliabue, G, Stephenson, W S, Bitto, A, Li, C, Jennings, V H, Spieler, J M, Queenan, J T

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Pregnancy outcome associated with natural family planning (NFP): scientific basis and experimental design for an international cohort study von SIMPSON, J. L, FRAY, R. H, JENNINGS, V. H, ZINAMAN, M. J, SPIELER, J. M, QUEENAN, J. T, MENA, P, PEREZ, A, KAMBIC, R. T, TAGLIABUE, G, PARDO, F, STEVENSON, W. S, BARBATO, M

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Risk of recurrent spontaneous abortion for pregnancies discovered in the fifth week of gestation von Simpson, J.L., Gray, R.H., Queenan, J.T., Barbato, M., Perez, A., Mena, P., Stevenson, W.S., Pardo, F., Kambic, R.T.

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Timing of intercourse von Simpson, Joe Leigh, H.Gray, Ronald, T.Queenan, John, Mena, Patricio, Perez, Alfredo, T.Kambic, Robert, Pardo, Francisco, Barbato, Michele, Spieler, Jeffrey

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Infectious diseases: Further evidence that infection is an infrequent cause of first trimester spontaneous abortion von Leigh Simpson, Joe, Gray, Ronald H., Queenan, John T., Barbato, Michele, Perez, Alfredo, Mena, Patricio, Kambic, Robert T., Pardo, Francisco, Stevenson, Wilma, Li, Chunjun, Jennings, Victoria

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