CINXE.COM
Just a moment...
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "obgyn.onlinelibrary.wiley.com",cType: 'managed',cRay: '917bd5ccdbfd9f97',cH: 'wl3Yl.VH.06rgJFL6Vbk64QZsfy0ZrxCnRxrFm.Icaw-1740529916-1.2.1.1-nJ7oCFzTXl754VFK6VT_6FnzsflH_zaoZ9U3wyiGnMWNP0bi__8i2T3qcJijg9YM',cUPMDTk: "\/toc\/14470756\/2024\/50\/S2?__cf_chl_tk=YWoc9obFz9EKpvgZaZPKvWhNBQeF4R6Aqwr0p7AyZFs-1740529916-1.0.1.1-_Bg8ex0gwMmskn_biCtOdKad9ph78rU1axq42Ci0hUQ",cFPWv: 'b',cITimeS: '1740529916',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/toc\/14470756\/2024\/50\/S2?__cf_chl_f_tk=YWoc9obFz9EKpvgZaZPKvWhNBQeF4R6Aqwr0p7AyZFs-1740529916-1.0.1.1-_Bg8ex0gwMmskn_biCtOdKad9ph78rU1axq42Ci0hUQ",md: "792ftZM5C3uVdzTzwIlSeCop4QJqqQQ55SeH8yGP_aQ-1740529916-1.2.1.1-7IdqejiD5nyF9E0BWIn1PYKpbXUu375SdFBoLxJVFw5KaalvGX4vl4gfeccRTEdT2H.bEmjHiTZu7MFu4NOgLYInPZChdUHBXinsYBHIwYLRcwCiSrwgVksGguOXbnkVqiUELYf6ZmPJUh9HYXOALZ_VeZF.SkC1VsHM5l.vFZ6OI3WQpY3WGk9Im9hMF0RC_lOW4CUDKN2nQmA3vRtGBM6_Nl_wOzSbZJ7Y1xCqSDMAv_XzYCEurj_YmDUcY75FhppzVRfqjr3ov4WKKxwkg76c7Fx9MyUoDxdq424bGBnfbGYOQeTo8uNwsJlrCdhnhzXhzBu1fQZBZDuEsG1NizznllejUTbqGlWV4pLv1Zpw0Wy3e1nz7LLAFqX_JtyYjfTmtKQY8UH7zHIMyKmV3qNJimtyd2MYaH3ZkyjB7icNrSoHWZCq.ksJWAn_PZ_aSLiU2Yr69inwq5PNlSO7d7qFupsGM8HBZSbZmjNNbf58GZOnmQuHOfxaxqfp1dgMo1kaNThVqGQ8G8o2VA4PZoSViuf9Zz3V.MkPH8AnAQX69GT8rY.97R4EDS.elnOdu2Uqf2JiXGgHp7cVMpgpjmp0JE0KtZYwca2dNaDdOuCQnceLZxXdfmQx4JarU_ZpqXGLzMqaGCrXxe5_dcNQbHCE_OHugk2c0XQvd6kRPp5Euy7rZjdCromkbSU5IC739B8WCBhydvIOf5tcoK5etY_i.tJG2lwEmK5VAtawOyKAmvBX5BadBng85Ga8L7YTnIR7eO3dOyinq7k5Nv604193az9HlEuqVjVOayInEBUefEVXdw8xu6kDtY_QdjmdpiprxILQge7g770Wgms.h8uCBllvXXLRR8448vpnUSPo5pmMXHkcXY3E4YoVsTgQrO0XjMmJ8Df6YfZ2FtAC_h6EsglPpmYxNTJcPywQCmXNIVcBAre96KlyNbiUtlZsAOnf27H2AaZCCgVpxXK9prJXX_pNdYOklQXzoSc2y59CH5OjkwVBR6drSTZ39GrxEfd90S3rm.lN6Pob2kvCor1.Lzk.yLe2BIXWZRoA1_AICWXAlYD2Q9tOz8yUeyGWakY1CTAtaIo9q.mVDEKmOhrxmFN1k5jPRdtOt3Beb.UhWKYXxpDdcFmZZlftUOxoo_QI2zS9ErOK80PlFhLpGENbInD7aXmy.N_PQBATmr.DOfToz24fEMR8SRwD7BTfvMxrAsvNlU_m3J1juvxjSEnbhQ7p_yH8u1TUXsToSzh17cphFYPnOVlZGOjNGWCIcua2czwuciGteoEAm87X4TkdV1i1NJNSXB2MLIoolX614Wo1lX7sZaSKX_9H5RCLOLIINeEx5jlst79JdeTkuC9rs2xi1qtcuympM0pUmwkvgrfWvMJ.bZHCYXEKBMfB0J5pIeOmgU5JhbYo8r9D5GBB0o1hIw0oROiAvZdvXzwN6AFp3Rrvp5i8vUhIS5oMpHTUi80KUuQoFfp0qQURn6otSUqKJl0faAmEMT.TlR621IpQwgBb2wiTzQS8k.7yZlbG7JmFU9jKL71Njsetvnrcrq3GL0y3HcePY_TSeJRn4bktqHT7im08O4TOga9_KSZ7yPvv299U.bfYcWaXybdX8t7BlFHpcKUXSO4IscPvqkCQvew6_dZ2cmBxzl9khLtd9QEqPYu5GVmyV_y9HsJ5JFtSBIhmR9tixqjul7JkLKJPRjGpEoQNglj1AfKb3FXXAbZxZqUAzbL233zbzmOTEek0TCvUfNyBQBD4Wnh80qwUz1kQRpGx6BOIwYDA9uUM3cK.HxLdVCnCJSRFcU0E7YB1p9v8RSwC03yuO5sJtYHyUX.Y2hO2lAWGPp71P9gHsOJHzH27bnzWDpzfSBw.UNVkJdds3J.uOqQPYTrHZWW2WTswwkOtnKK7BurTuD61z4ck7FoIfi9Y0nxDmL9uRFnFHx.n1pkbeCHXugGlUvFxpVIHfqns.tuTyawz6p2LBGmAAWx2_trVPOmbCB9UIbfDbWts8v2b_xpFEzNn3U9W_4Qdp8uJc_Hn6.5MM_QqVOODW43iXNF06lOwljUXScq8c8QkcTou9k2kTw4nkIh.n0R2YTMXs8UOiR.OT_vynBvCS4Brhe1aSEvdHaKDgLxTQo5MOtHafyZDErBCkyUHGSYgEc81Ruc2hom2kORyxuwIZQQJfb2MWPdoNfXPI6nym_NvTepHRehV6QIxQRTZQKJj5A8sjxkOzgKCoCDCPIES7nrC..Ll75e_swbLatN2HDd7d0WgQq.JImljXfPt3qkXdjyfDRjErOTy3pfici5PyLAhLaFRhkTXhPUAWrhtvSwouDwREy_JXCk_pHZBYGjIotxZinZYVFtTMpcbKD3TuhOXQqYpzf3yHoCXWP5pk5savDlO2fHAo4iR5ZPKXWOYjMuYYc5z3F3h22r_Ybukd2.FTZESlJq.XuaCzFedIIE4wLP7_zPjT2I_savfg3SZHRA8EIrGGSVq5RA7J5_HxBJNphfXMpvqDuE1KRsTO4xZ93kqZ4mWhmwnt8lIBZWWMlU6B8RdCW5wF2d6xxf6aXU.hokg1x.co8ro4anJrifumnTuZMaTTMY",mdrd: "FXIQh6e2isvJQ3uuXpsbvZZyWKPh1wZ8Zem7CpNCrx4-1740529916-1.2.1.1-SAowK79eAfe8Y4DPHicS3z.v9GY5q7kqonun1QjXLd1RXQ2grI5AgKP6xfvyJiaqamhcduRKttRPahHj1L2gHUHEouUmkOGaB8d4fnkL9inqricZdK6mQTh5W1Hlk69.GMhm.CuL.iPaRoOFiPJ3yUXiMuNTigE3XSfwaDHZOsEb4mY_ygtlwO7cwvU2uXmKHuvOFsRxKqwLQa2OolAyL_fQojmA0iQN0VyRIWrS4_o3Um2b10WeEtMWa02yCz1s9OJu0dkN0O_RsRlBJxQtRpgJ88H4EhUDoLJxnmdGkdNxO68MWfq1r5KTZWTQThjopha3Km17.9QLRBzlV86f0vnnqJamvWHAir9ObrOo3oqhEaS2mocUrs.mCfVAibQCPSEQVPTLZOkzpb1TQArCADRXntlz55w5rINoPBthJcGqWtbo.IHKR83DxfHexEGDuS7cuyH2fswewbCR9MALZO7ZZZZ_FXqoAJZKCtTnEQGBAITkc14UqbhBWHi41UkN5d1AYI4rK01AXoi4UJHEpxu4LpHd2.vsNNQGbQvmADJbzrH6GwD91XLYAF70qXt3gDIO5TF1khdI55KqPzmR6_pjUnDHEJycX5H7D8Ln3C9i8HkgYfSmioqegMFMvn9JZelNbU0uEZ7CK.DZF0d3UeHjN0T29E_gDi3E4i6aSbBl4MVUvkJWngIGdqQk7kkmBOVNtPA6f62pJxdtoZ4QEY47rdlbsr2l.UblzVMmkh3qZ6qPe2Ef_XG.5TCnk6ZTxOfKPlY0K96ZQWUvasdLLSMY80OCKnqNw7RPXsrKkfa4km7d2UvbF4_x6TzIFv_AIZvPLtf8RgkjGPIv9suycDvW6gV4vEngl5NSKXHZhGkWQda7mXpEgZsN4Vc1Yc1uZCzGFxcjtk1gBTsctJwI4emCp2FsaHuQx9l34L3to5czu3UvisPh7btOhjNYKzWzppdujjlDWhnOkZJJ57fmCfc2eiS.fuLpfVL0nE8j7j1G0V6ZnMygpZuYT6hpP9E3EEVX8VeDP1L7bSMq20BuPan1v9APvsARHkr59pVxhhFW2ywocUWqMdasv67AJstJcCFDL7SBTVUH0touGMtsPFYPUgXBUGLrZfj0sDLSxs283jjFqE2bn6sWbf8l7It_mlIFDFwYFs9.OouOXd8GLUCl1bmsjytE.IJdMpG2Kp5uBqScHJNGZRPY9ekxfrwk6L.IDt40DvAu8ZCO0cFkdcu4bLbA464UwgQ7zZtfLKxPjy_bZO5xMR9n9JsOeZT0cCCvybY_JqDT2vQcIqxtBUICxMTAzBjibHJMCbSxh_tCo3F00lbBmPVgf7v6qIOaKE1dtPKrvS8sZbIbkm9NnDVFk2ISnT9FKR8cMaHpKJ4qDFMnXu4lHa0ePofCRfylFoPMq0BQw1.6FURxCPM4DaOihNYQQ1H6foRCHzd4m9A6j0PLLThZ.i7JORbXlOBCcM5TrOWja5Eg_U9_Y3nawjxWi0SK5v4_c5X6DKgJHc71jBbynbIyJxTafs.aP49nLnHgj9aCo9GuuH0MTgUxKu67XqWMWLZOCFO9f3pOOQ0b_KP7bC0U64oDYhjZ06IAVhWmKTZi6HbOsQfxDQ2eF37MumcDpWCjKIDYvHwrzRni99XRa9ps9ULGfc.N_fgqImkAJNRo2SrkhcpC8Cs0tNiDA8Y.AWbnqgcqj2K7P9Pur_nYNoHh4McslISugZrjbG0V7FOR88Hsgtxn7wosI9HCHc9VI4JUiWWtmJ6ePRSdsH1.DSjb3alkNFvbUvEOFMHj68WXR86eGMV7CmziSNmNvoNZv_ZR2D5by6B4ebsDuRXXakaIyq2sp._VM2ZwF2l6NmQ0GvZsbsCzBOHAUwS_J0AtEr5YW8UzDNxA.aWF_Oe7SxLoa.7JThNHzXqDNCKg.Qpr8c0Qcn0fMmCIQV5dVhp.I_4kyEUr6oVpOKxl61LxSF_68NBW.Bzm3aJkFAe4je7eE6hp4kJp4GuwuA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=917bd5ccdbfd9f97';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/toc\/14470756\/2024\/50\/S2?__cf_chl_rt_tk=YWoc9obFz9EKpvgZaZPKvWhNBQeF4R6Aqwr0p7AyZFs-1740529916-1.0.1.1-_Bg8ex0gwMmskn_biCtOdKad9ph78rU1axq42Ci0hUQ" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>