CINXE.COM

<!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: "www.hindawi.com",cType: 'managed',cRay: '92d569439dcca029',cH: 'RMphGys4Eb2Ybsa8NnybCkD73YwJgyH2AlfBMQvfplY-1744153544-1.2.1.1-Iuoc2g0NwdhvJmmrL27rBQOEQ2Jg6Qf73Y4k19J2AVoJ0S6OMad8IkfeIr.qENzn',cUPMDTk: "\/journals\/aaa\/2014\/848170\/?__cf_chl_tk=3Bcvs.GBBUsL67VIu.CNTysvZgmaUPap3Xvr36SNlbI-1744153544-1.0.1.1-QVLaRG.XQMatYrXufCArjrpqqeuAVK_Z6f4rqOFnWBc",cFPWv: 'g',cITimeS: '1744153544',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/journals\/aaa\/2014\/848170\/?__cf_chl_f_tk=3Bcvs.GBBUsL67VIu.CNTysvZgmaUPap3Xvr36SNlbI-1744153544-1.0.1.1-QVLaRG.XQMatYrXufCArjrpqqeuAVK_Z6f4rqOFnWBc",md: "dUI_EKrENxR0rujXosUwGrIFWdHSC.YOhwZSdO8R_rg-1744153544-1.2.1.1-nVGfenRAKdG.JFKsF1UNwEGEBMvuuYwK5tGXqEmvvQwlUqpKcU4tvT_H8nPhdjldHFV_8zuCTCQeuCNs6gpZu3mefMbtuiO15eHxozpwhqfmIljCwpc.FV4hzpz47RY2.E.xm_.dCXZy3b1oKQ5k7VKLK6StQkWHy9j.khOSfi0.mXK9T8pPahS6m_1M.yS3NIRQxg3kGLm_8ZVRbngpZw3cf1IfctC47StZcmB4aI7HGRxWTIsgW0XzonaIvQ.IjiOB0c6vGA3b9RRI10cBEPqyzaRaw6Ez6mw3GO4la2HX4WSazQjnrz165js4WfBDBvAWocQ8ZdMtyx9wn.nGJMxbH5J9rrcDe_5r6Bv50IoHsLwUQGZnr0MFR6kydEyVPZjm8nevHxBcQJMkSXzeA_nZgxL4DfVcKAEXKVyuWlaz8ES5l7KiJALqZUo3olWV4jQnbAKzBLWx79V2JKYbfNryofzB3jYXN_O7sFSr_djrcfzAhyiGZ1IUSIRNeP9xBr8efZhPL0h_e.bhNI0iaRcXUWWlQUE6c2NSK54CU3rYbphEoFCIc3rokV9jz.9zlFyjJns7Eh89JP0p0PKOmjiuot3qtIPH_URN2bqFjpj2yFFEYYwqFYtJrYPqNDUfW1zVGXtso97KsgmgXokj1vsrILgHAZ1VzZyWM19OcpBjhUJL4x1d6UqSiA26zhWa5OH4jTRiTrWSczcgiDOXo4ZlJhdaM4n_.02QNRoxT2B2gAKFuNkKF_xqq0ET2Q6HQwwtxvuT0343rWuFG6RPTeTSw80EHKZ.Pvzu14cMYh1twDkUbXXBIKjXxDx3g13IfU4rmmICBChjLUo2RG4tJxWF55tvTiXIHiM6tCXP4SMX.XjLF_Aypgi3aiWszUOMCM7ZfiqJAYC9fNDsIJUwvRzdzcBq4DEqU.gx448wuwjyv.8n5DVO7NxSY92qoWiNsUJp977dXamWzsDve0ypnq773_sTNKyCqG6t3IPOOvHLIRvv3kucOWv25F_v1QaGokPKM39syhiaqVUsOe08HGYxFutsjXMIlRn.eGepYAtFXxbkEJA3jIX8KsqQN7KzPP5EtVI7k8i3nWQ13rih5m1Zi7esBOPJQ5SkqXkhOECIO8ttgh0bUVk4DU5mvd.t.5HMcTIXPCqduizgozW0n9i1FThE8mHLGUMX6I3k6cCwp9QR.aWb5kUxsoIfKPw4FzKo6JKgOmPeWyScbHwyI18UrDpYLdQ19vA9B9fFa9N0uPJFqOwwgI0AJv6gZIKiPRFZI_KnY7S7VcOyTORZ4Q",mdrd: "1gjg0otFk402PXvOP4kkSMysWqeXkGbjv5ZW4vg4B0E-1744153544-1.2.1.1-vtWre_iSQi2YuY.ZPSGxLI7abGf.8924S4jvy3DV4GInV4W_hGKQk83LlOSTUNHtzowECAAtYxtUuAYBPatQPjCna.aCYwzYqV9ZSswdtaJgZPoHdS9U3YTyWbnzzPuVTQ0Ok42x5X1gyr6rPXG92iwlbmO0DVxekr2OGSO0g_rwJJnr5gZlcF13nKlsNpJhlYejYjPb3pV4uvxx2CjF3bIx2nU4DrDK3eHHIxp5o_IUQ0QTgMjYXark1uGo8Gvt4TGtVvY4_R1WWQl7NBhN8kYHhJ9o5uiZJf348d0gP84lJBfpH57hqZjmT7dBKKdkhMRNE335MWOfyJ58sjBTC2ISAWY9G3qTZb_0HhV3YNiZFl.8_XDJjbLTacTyvm5qtQDqr5CVy12r6W1Ypel02T8cFgOh3HZxTnBWnwNh443Srthp3MYpPZGKZmx15jQYjgb44dpi_aI6tmPqSv.L7H67fFMuHLE6K_.tTzMjAXUDoH3o9tYnnwb_pKWZ2ge_9MYop4vAeBpx80l1kBRs7CbvHilIwn1B.883iTxo.ObtP00dzrk8hdBwfO183kFKBvqpSYhF_aHjDKmsNBfL7DHdFKMJNbg8hDeUK9CWU1.jogjEwOd7AaNJgKpseKF16C5pfJUH2XoznpPG8.HToYC1itDQ7wL1aqp3ZJGCjph0m6lsYi8y.EZV4NgjRmaLuwandMPkfeNei.DOW8a2NwuoNnC1km1rMlRSlRy.TqFmvHtanD5XUqzM3UpNj8z4sYnUnWk7o7zWDh55h_ejToxsB3w3_ZQFZDBH8gEzxdniYhNCYCB_iX4Hq_nTjJeCv8SoOz2XtLBWn4fZLT9t1_ZXJu.NiokJklvWPVHxb9WtUnFirfNCE1aKM2t88tckmDpJ2ZF6WtDxfAElrjMIIWOHKNh2l_jzeTFyXOlc04lAwmI6ZYZe0JOApoqV6NQf6t4xjluxZisnc0ZeTatvpZqffnLs5LmkipGnL_1pKF9WxF.a8xIeoD9smXHDXb01UALqGNRBpeH7WDAAFZLARx.ArPwpOaW1vCZ_VJ4iRzEp82Cv54zn3D6o7Zo5USMIk3lHyr_Y0Ewhb5wCRQMB2vF5wNGaE.XBmgGmpSXUT_NB2F6VO0apCiQdwh28aZIuYV4s5oxiVbpfIXFTHiT6xHne0XnSAEgMBL70RSJgHojin_pJOxNNLoYxVO9KNPGQT3ocoY1xuxqDJCV8gSers6W2PqyQnr6FcrhQ_3DPilR9dLLPUY7upZ17t9cHNV8cdHbXyAVfv0G2tQ_uITJ6Dq02qQCCPDooecnlTnQE5v7QqGbKdTcCKgiVLuph7CrDGDwrq8B3haUCmxufLmKstNeuxaoC9Zr4LRLBcmtmpK3x6DyEz8ilqnA.8_z9TgFSW4iN5hC.H_KOGVXoa63IRyPdcLvNmPsXu0k96onZtM_8x3qSRi1tbmeL0dujHSaUM5trOb7nEQJ2A.RrD_xQ__m0XzKaJttV4KgIdkN2Dx.Ar.XJk84.a1di3dB.dhUzfnvtFhE64DoBl7e7RFE4rMBrW.F13ms88XXifwM.JzjVrYN2GzEOb6NJR3JzAI1AcmWZKen2xYN8_4Hxv_yVT3uHFqH8i7wVCZkrUCB.2uZv4UjTMlTkd8m22NszyTRyDzI7uKWM0CSmAiWLuQf1qwQHS9_daMJZNyKtk6qwTqYB2M3R.dF9ImwjwM0dUSswMWf8QshkYZY9eFH1jukjIWqsUFzcwPSKfYw4h4ZBUsusqepOjGM7toLvA8XaRm9KHRAKaUo2CcyiA1TxcmidGVsE7p.XLlvcPDnQgmd5fLMnDiZdk_ZhqPDm3kkeVcStt2NTzB4RT9EFpUU01M1HGwHGy7p.ryyYaTv2v2PWD6s1bqOQO1zcEEYtvoSt6oNVP8HK3jKGbdt8P6i2zjxvIjqjecaAvhDcF35JsXJq_qSnJZRByd3PIMehAvPxD1jfRRf63OAKulrIbsD7_E_eCrYREkdBKDOkf30UjIia86KRkTpIFyYk3BCELnSvHzpHAqhMjsz1i2LDbQacmg20vQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d569439dcca029';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, "\/journals\/aaa\/2014\/848170\/?__cf_chl_rt_tk=3Bcvs.GBBUsL67VIu.CNTysvZgmaUPap3Xvr36SNlbI-1744153544-1.0.1.1-QVLaRG.XQMatYrXufCArjrpqqeuAVK_Z6f4rqOFnWBc" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>