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: '922ca40c6ee581b4',cH: 'GS8GmtgA_N8qY5oMfWwLyUd.2PGcs2Ta.BOJqpqagoc-1742383858-1.2.1.1-yOYKAmXLwa2ElQdl9dh9HToTIYEQjrSKEpB3F4Tr.Q7dzeSsXv3t0L.OocSsZ8NH',cUPMDTk: "\/journals\/aaa\/2021\/5592010\/?__cf_chl_tk=d91Y0O2oEnbk34OtJxvuB9k_jlYvRkU3S4Vv.ecshjE-1742383858-1.0.1.1-aWI_g4T7JIvB1vMDPaOPtRHc2hwZekjb.U8t1E8vud8",cFPWv: 'g',cITimeS: '1742383858',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/journals\/aaa\/2021\/5592010\/?__cf_chl_f_tk=d91Y0O2oEnbk34OtJxvuB9k_jlYvRkU3S4Vv.ecshjE-1742383858-1.0.1.1-aWI_g4T7JIvB1vMDPaOPtRHc2hwZekjb.U8t1E8vud8",md: "yEKlqHTTHwZzFfmEkRuIZoH_5C2V1cULTdbkpLKBhDY-1742383858-1.2.1.1-AYcdTwnQO8J9m6gFLOnJMA4gh_1zqyEXTs9KaRC8m5ia9_Rp3.OLtT543c3bDxPX_dq0zY0TOLYs9_cBhYGXxH.smMbT78mW5KFi9zg3W2n0OI7_waRbH961OxjVcXCgpEvv0alOwQJRhLXS5L3LSk2qiXStAsKTOaGEgpSqdvfxZFK0BM1KWjkDksRW2RFeJgyNYbe6IUtWZ_VhjZnmPo8DijXlTgMOaMf.Pq7ybEhDLoHBpqVyzW22caLAISMY6oCE9V2voO7HhXtURGghMjLUdQRCsiXDYa8GrpcRW6KR1T0LoR6ZN74YN7LXNG6V7usyo_Q3Zfn5R2yf30lMMzNBzJB6yE1ZB1mcMGLHorbXlsM49uPd88nXNU.MHWJFdQj_NjlUdOl00.MlWA7TUdd5an0caf3fY0B8fsRlnmigqz35c_21Udba.l42kHVBDTElp08DPN7WbyfTI7L3UHeJcYtFmuhGhN9.LpLvvYOOKUMaM8q9Lt5SHeuCd1PSKNQNDY0iXbLmw8Px1ZcSr2sLfh4gFV5IY6qvQMwH8sak1mmAoGfiQstddmrURj1p0Wfi1ZmvEKMLluSUZWYfdTkfeXSoAVywCROKGzeUaUoqwKHzSo5VDFoFxJamahEVTHydXg_QRc.UA0IM.NXyYw0K8qIs8ewnKmm3Zsibhnc1ZCoGPCQCw7N8vKvqkaDFwHt7RuQzpqQpq1qOPJT7t_UszeutWPPVs9FCdAXbl3VBBWvebzvllDzlTn0D.fone_gaTm_0rVYXC61NKPoXuLdLy01egZqvsiSwcL.Yv0f2uRFH6xc9AggdVai1EXD_R_PrXGRFeD51iYzDfP_VNFEsgNRai5Zmk21f8vIjqgn4LQhrwa8wzdC2TSwqaexRkxk7JwSyE48F_VwA7RYFOMySBnsEisg3oTk7F9P8Wa6fNUIXjah09AKJ2CpYVzCZDWuGY_fZccYJ17NNvrThN2_IiLbGWsXlBDmjZQiWsAiQnrHv72ZrDmJvZPu8No3tToU5GnkeYTbng1xMgkhzawIJemtuSryDgt7mgQwO1bufQay7aJrNm9_CxWDTCtdFYWSaoGlnfkv.oXnni7bk9LMwKCmPHvc5OriXp2tzH9BR3UlPQuUo0PLucG8..BhojeKR3oX8RB0tgP3pv8TdIXw2sFDZVfUeTfrqFDU6XYVAsIFNwFwJuNGvVxLceySmX.5GlkB_Myq_m8BiK0Gln5KFFN72juXdXsGbi_Pwi2GQEZgRfGBIsSwqhrKWCufDmR1D2huK5sPSTUTca_zcpA",mdrd: "83.UFbacKy85rIrmUuecQ6GtBKtMVmbQyuHAACoIIjw-1742383858-1.2.1.1-kVFFBLeGxw6axv8ADDvw.I_Jz4ouS04zecAttO5P2BQpIFg6Xd3G7JPWU7aBEBgDbIXsSPVZfW4aO042oZqfwq.AWiyu5lcjLyt7Sl7IQifX6hIlHOSv1KXpt.of6yGF62Liq1nLfWesXjrx56DGYQiyW.7cRHf59HtXrT91BltwM5nBsJg3JtZR7FDRJDLEZd0PDziMlEa_n4_TVwX58ZJZYTJmxmVhZ6PotrvbHSKFlxJ_SuGYNoER8s5enipdtxshz0wVCERmO.m841PX26L.d7rldEUY57BKe.m83J.VFy7bAZFiMj75FSLnzQ2V2mdT8TYkDUHQPf.W2FCVit2nJaXiJokzsihHrho.LmIxvKgCadG6AVSv.YBZy.RCMGAcvYWHHJCm0KbRAWDFMHLTY2lkPQJ57ABDePLdNxDiIwfop5q9eA57m5rtLTVBLXjyEfj5sB.PE9BpKlpHQmZFQBnQf4s4jG._CAB.BYTEVAI0w4YYiM73lRdrv4asBGOokWzlijdNnlhYQ5gfF0qnSchvm_UR75lWqKE4FEKqbtGChz.9msJwHwuR8r4iPqBQBpFhI8iElrQIgrItA6MzYYrxw1GnfmQYTjJYfK74xyGZwydYwElCKh9OWtDq1NFVTyCwZ4gD4eZMQnPyuXgBwFJ1RSnmYfdYy_OENQU2uvoZENr0DDL_T.dAi4aK5PUKm1HeZ4VFRhvkjisHonFuTDBo_7S74HdGtjTfXnoIO_E._Dh99i5arljsFwMiHXhebDDK0KUW_hfYUpfozoVZQDtWhNAJC0A_JgY4CBhhA36BY.WRoQjAaP1tfBUYxVnXdz64XA.0cvCX9z9wCm4oljHzKsy58IN3K2TcEmvyRho_lxcjt9miKUDiYm6rjXN4BTOnN0nQLQRf6GvSl_TAJlxnGpClhyGWv7RCtJJgWiaMwipgg1pgws8mZSQTgkUs7Skj5rt9Ojl0xoMGkWqDBsx3Y7ckltMMnrW58O8kHKTec_JSKmPy.HFoW4Osy39q19P6Atg8KbMjBloFUvI3M7TXma4JD0YpsV7HVrbJsm7QgzxXjLLX0jlDSlvIKdoLVaLlANeTy6ssN8KHeBnXuRnFXXBcVVKmJaOtdkrKlvdqpUgSqf54m4L0vaPpPzhhnqSDPVHRJI1CPiuvcJLaE0lNOuhwX0V5ICWsckFaaC4NzzW9tQMciE8KTtzdxX3QJ8UD4W6dH8M.Bt7TUhx6l2eHi7TMKdpYflI2KHEnrWVA5zTQBeMlTfiRlaLum7MrYjMWHNKFwc4qhTG77jfqrVA_XgpnKyKmrnjO_.YY911HdjAIKznLWvsh_7Wh6c___g2NcRkNNmJiIQqeox9ZTKjttRpRbRE3.iERNpk94FBijOTx5WbuCluccXROGfGeRxvD0LVUYGnPVCGCcFSc7EJdrV36q8IhGsLhQ3TmC5luMgPYq1bJv7j.R.CiNMYeh4Gg9WULD0_Qcn1Ti4cqy9UQY.nJMGIT2yd54sAT18XlCA0nA_YW9G6oeQpbxfevJuMUTkNmT6gOBFWlUhFTM3yZHLqb1HIrGs.hdyI8cYukG9ProozL6fk2yqaATo3CWL8R7bfE1FV2rq09WKf.SK852X4CADRyBEJ7m.n7dhBrgcgSHLuXhUFqiNjlaymmd4kHcZyLBPD_iI9jJQj5WDf3jMXzKKAyPm_WZTVD8OpdCb2FLWPuNA0WYMpy426oDzxgZZM8uVoCkmr9pPPI0tF79HGExVPxIlUXpFRB.2HbTJtrGYKP6wWgJYsrbwbeB6nFfu7aMnH98STuz6xvFZog3My6nZqSIStnyXQEIj8i635a7pKAVAGB3Ov_mAriOk6i.UsY6S65BBjQN9o8NQ4EaPTA3dWKPL45v8rFUErp6KR2u7.9SRHW3SXFSFmRt.meSY0QSJecrdZnIERuXMMilUkjXeQKwLU9cIJ7XCm34lOvfE5q4TBQE4DVb1IK0zmDHpXYLId4vXW0x_N077NESHFMM_mngD5RyXeK5uhTHPnXlwiyp4Y86d9h.b.ukFNg2LQJ4wcqUWePpfyMrD0V5Fuwx9U8NNgSDNQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=922ca40c6ee581b4';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\/2021\/5592010\/?__cf_chl_rt_tk=d91Y0O2oEnbk34OtJxvuB9k_jlYvRkU3S4Vv.ecshjE-1742383858-1.0.1.1-aWI_g4T7JIvB1vMDPaOPtRHc2hwZekjb.U8t1E8vud8" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>