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Henneman D, Snijders H, van Leersum N, Fiocco M, Wouters M, Tollenaar R. 504. Failure-to-rescue After Colorectal Surgery in the Netherlands. Eur J Surg Oncol 2012. [DOI: 10.1016/j.ejso.2012.06.447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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52
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Stiekema J, Dikken J, van de Velde C, Verheij M, Cats A, Wouters M, van Sandick J. 101. Quality of care indicators for the surgical treatment of gastric cancer. EUROPEAN JOURNAL OF SURGICAL ONCOLOGY 2012. [DOI: 10.1016/j.ejso.2012.06.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Snijders H, van den Broek C, Wouters M, Meershoek-Klein Kranenburg E, Eddes E, Wiggers T, Rutten H, van de Velde C, Tollenaar R, Dekker J. 331. Diverting Stomas to Prevent Anastomotic Leakage - Changes in Surgical Strategies over Time Comparing the Dutch TME-trial to the Dutch Surgical Colorectal Audit. Eur J Surg Oncol 2012. [DOI: 10.1016/j.ejso.2012.06.318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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54
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Gooiker G, Lemmens V, Tollenaar R, Bonsing B, de Hing I, Wouters M. 503. Degree of Centralization and Outcome of Pancreatic Cancer Treatment in the Netherlands. Eur J Surg Oncol 2012. [DOI: 10.1016/j.ejso.2012.06.446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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55
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van Leersum N, Snijders H, Henneman D, Wouters M, Rutten H, Tollenaar R, Tanis P. 321. Application of Neoadjuvant Radiotherapy for Rectal Cancer in the Netherlands. Eur J Surg Oncol 2012. [DOI: 10.1016/j.ejso.2012.06.310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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56
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Luitjes S, Wouters M, Franx A, Bolte A, de Groot C, van Tulder M, Hermens R. PP095. Guideline-based development of quality indicators for hypertensive diseases in pregnancy. Pregnancy Hypertens 2012; 2:291-2. [PMID: 26105417 DOI: 10.1016/j.preghy.2012.04.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
INTRODUCTION Hypertensive disorders in pregnancy are one of the main causes of maternal morbidity and mortality. Internationally, several organizations have developed clinical guidelines to assist professionals and to supply patients with the best possible care. To improve the care for this group of patients, insight into the application of clinical guidelines in daily practice is needed. Valid quality indicators are necessary to estimate actual guideline adherence. In this study, we developed a set of valid guidelines based quality indicators for hypertensive diseases in pregnancy. OBJECTIVES None. METHODS A systematic RAND-modified Delphi method was used to develop a set of quality indicators based on evidence-based guidelines and the literature, about hypertension and pregnancy. Experts' opinions were used to select the indicators regarding specific criteria such as efficacy, level of health gain and potential for care improvement. RESULTS A representative set of 14 quality indicators was selected from 48 initial guideline recommendations. Indicators concerned both professional performance and organisation of care for patients with hypertension in pregnancy. CONCLUSION This study describes the systematic, stepwise method used to develop quality indicators that can be used to monitor care for hypertensive diseases in pregnancy.
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Luitjes S, Mesri K, Wouters M, van Tulder M, Hermens R. PP167. A process evaluation of an innovative implementation strategy of the Dutch guidelines on hypertensive disorders in pregnancy using a computerized decision support system. Pregnancy Hypertens 2012; 2:329-30. [DOI: 10.1016/j.preghy.2012.04.278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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van Gijn W, van den Broek C, Mroczkowski P, Dziki A, Romano G, Pavalkis D, Wouters M, Møller B, Wibe A, Påhlman L, Harling H, Smith J, Penninckx F, Ortiz H, Valentini V, van de Velde C. The EURECCA project: Data items scored by European colorectal cancer audit registries. Eur J Surg Oncol 2012; 38:467-71. [DOI: 10.1016/j.ejso.2012.01.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 01/03/2012] [Accepted: 01/05/2012] [Indexed: 10/14/2022] Open
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59
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Martijnse I, van Leersum N, van de Velde C, Rutten H, Wouters M. 6001 ORAL Surgical Care in Low Rectal Cancer Patients Can Be Improved – an Analysis of 4084 Patients From the Dutch Surgical Colorectal Audit (DSCA). Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71646-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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60
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Kolfschoten N, van de Mheen RM, Wouters M, Eddes E, Tollenaar R, Stijnen T, Kievit J. 6069 POSTER A Combined Volume and Quality Threshold to Reliably Assess Hospital Performance. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71714-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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61
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van Leersum N, van der Hoeven K, Tollenaar R, Wouters M. 6108 POSTER Adjuvant Chemotherapy for Colon Cancer in the Netherlands: Who Are We Treating Actually? Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71753-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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62
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Kohnle V, Léger Y, Wouters M, Richard M, Portella-Oberli MT, Deveaud-Plédran B. From single particle to superfluid excitations in a dissipative polariton gas. PHYSICAL REVIEW LETTERS 2011; 106:255302. [PMID: 21770650 DOI: 10.1103/physrevlett.106.255302] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Revised: 04/28/2011] [Indexed: 05/31/2023]
Abstract
Using an angle-resolved heterodyne four-wave-mixing technique, we probe the low momentum excitation spectrum of a coherent polariton gas. The experimental results are well captured by the Bogoliubov transformation which describes the transition from single particle excitations of a normal fluid to soundlike excitations of a superfluid. In a dense coherent polariton gas, we find all the characteristics of a Bogoliubov transformation, i.e., the positive and negative energy branch with respect to the polariton gas energy at rest, soundlike shapes for the excitations dispersion, intensity, and linewidth ratio between the two branches in agreement with the theory. The influence of the nonequilibrium character of the polariton gas is shown by a careful analysis of its dispersion.
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van Schooneveld E, Wouters M, Van der Auwera I, Peeters D, Huget P, van Dam PA, Vermeulen PB, Van Laere SJ, Dirix LY. Detection of circulating miRNAs in serum from patients with breast cancer and their association with the presence of metastatic disease. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.10506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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64
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Manni F, Lagoudakis KG, Pietka B, Fontanesi L, Wouters M, Savona V, André R, Deveaud-Plédran B. Polariton condensation in a one-dimensional disordered potential. PHYSICAL REVIEW LETTERS 2011; 106:176401. [PMID: 21635053 DOI: 10.1103/physrevlett.106.176401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 03/24/2011] [Indexed: 05/30/2023]
Abstract
We study the coherence and density modulation of a nonequilibrium exciton-polariton condensate in a one-dimensional valley with disorder. By means of interferometric measurements we evidence a modulation of the first-order coherence function and we relate it to a disorder-induced modulation of the condensate density, that increases as the pump power is increased. The nonmonotonic spatial coherence function is found to be the result of the strong nonequilibrium character of the one-dimensional system, in the presence of disorder.
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Lagoudakis KG, Manni F, Pietka B, Wouters M, Liew TCH, Savona V, Kavokin AV, André R, Deveaud-Plédran B. Probing the dynamics of spontaneous quantum vortices in polariton superfluids. PHYSICAL REVIEW LETTERS 2011; 106:115301. [PMID: 21469871 DOI: 10.1103/physrevlett.106.115301] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Indexed: 05/30/2023]
Abstract
The experimental investigation of spontaneously created vortices is of utmost importance for the understanding of quantum phase transitions towards a superfluid phase, especially for two-dimensional systems that are expected to be governed by the Berezinski-Kosterlitz-Thouless physics. By means of time-resolved near-field interferometry we track the path of such vortices, created at random locations in an exciton-polariton condensate under pulsed nonresonant excitation, to their final pinning positions imposed by the stationary disorder. We formulate a theoretical model that successfully reproduces the experimental observations.
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Courrech Staal E, Wouters M, Boot H, Tollenaar R, van Sandick J. Quality-of-care indicators for oesophageal cancer surgery: A review. Eur J Surg Oncol 2010; 36:1035-43. [DOI: 10.1016/j.ejso.2010.08.131] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Revised: 07/17/2010] [Accepted: 08/19/2010] [Indexed: 10/19/2022] Open
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67
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Lagoudakis KG, Pietka B, Wouters M, André R, Deveaud-Plédran B. Coherent oscillations in an exciton-polariton Josephson junction. PHYSICAL REVIEW LETTERS 2010; 105:120403. [PMID: 20867617 DOI: 10.1103/physrevlett.105.120403] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Indexed: 05/29/2023]
Abstract
We report on the observation of spontaneous coherent oscillations in a microcavity polariton bosonic Josephson junction. Condensation of exciton polaritons here takes place under incoherent excitation in a double potential well naturally formed in the disorder. Coherent oscillations set on at an excitation power well above the condensation threshold. The time resolved population and phase dynamics reveal the analogy with the ac Josephson effect. A theoretical two-mode model describes the observed effects, explaining how the different realizations of the pulsed experiment can be in phase.
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68
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Cerda-Méndez EA, Krizhanovskii DN, Wouters M, Bradley R, Biermann K, Guda K, Hey R, Santos PV, Sarkar D, Skolnick MS. Polariton condensation in dynamic acoustic lattices. PHYSICAL REVIEW LETTERS 2010; 105:116402. [PMID: 20867591 DOI: 10.1103/physrevlett.105.116402] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Revised: 08/06/2010] [Indexed: 05/29/2023]
Abstract
We demonstrate that the tunable potential introduced by a surface acoustic wave on a homogeneous polariton condensate leads to fragmentation of the condensate into an array of wires which move with the acoustic velocity. Reduction of the spatial coherence of the condensate emission along the surface acoustic wave direction is attributed to the suppression of coupling between the spatially modulated condensates. Interparticle interactions observed at high polariton densities screen the acoustic potential, partially reversing its effect on spatial coherence.
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Wouters M, Jansen-Landheer M, van de Velde C. The quality of cancer care initiative in the Netherlands. Eur J Surg Oncol 2010; 36 Suppl 1:S3-S13. [DOI: 10.1016/j.ejso.2010.06.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2010] [Accepted: 06/01/2010] [Indexed: 01/08/2023] Open
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70
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Elferink M, Wouters M, Krijnen P, Lemmens V, Jansen-Landheer M, van de Velde C, Siesling S, Tollenaar R. Disparities in quality of care for colon cancer between hospitals in the Netherlands. Eur J Surg Oncol 2010; 36 Suppl 1:S64-73. [DOI: 10.1016/j.ejso.2010.05.026] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2010] [Accepted: 05/27/2010] [Indexed: 02/06/2023] Open
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Paraïso TK, Wouters M, Léger Y, Morier-Genoud F, Deveaud-Plédran B. Multistability of a coherent spin ensemble in a semiconductor microcavity. NATURE MATERIALS 2010; 9:655-660. [PMID: 20601942 DOI: 10.1038/nmat2787] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Accepted: 05/22/2010] [Indexed: 05/29/2023]
Abstract
Coherent manipulation of spin ensembles is a key issue in the development of spintronics. In particular, multivalued spin switching may lead to new schemes of logic gating and memories. This phenomenon has been studied with atom vapours 30 years ago, but is still awaited in the solid state. Here, we demonstrate spin multistability with microcavity polaritons in a trap. Owing to the spinor nature of these light-matter quasiparticles and to the anisotropy of their interactions, we can optically control the spin state of a single confined level by tuning the excitation power, frequency and polarization. First, we realize high-efficiency power-dependent polarization switching. Then, at constant excitation power, we evidence polarization hysteresis and determine the conditions for realizing multivalued spin switching. Finally, we demonstrate an unexpected regime, where our system behaves as a high-contrast spin trigger. These results open new pathways to the development of advanced spintronics devices and to the realization of multivalued logic circuits.
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van de Velde C, Wouters M. Surgical outcomes: can we do better? Eur J Surg Oncol 2010; 36 Suppl 1:S1-2. [PMID: 20630690 DOI: 10.1016/j.ejso.2010.06.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Accepted: 06/10/2010] [Indexed: 11/17/2022] Open
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Gooiker G, Veerbeek L, van der Geest L, Stijnen T, Dekker J, Nortier J, Marinelli A, Struikmans H, Wouters M, Tollenaar R. 501 The quality indicator ‘tumour positive margin rate after breast conserving surgery’: a valid assessment of hospital performance? EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)70522-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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74
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Veerbeek L, van der Geest L, Wouters M, Dekker J, Nortier J, Marinelli A, Tollenaar R, Struikmans H. 528 Enhancing the quality of care in patients with breast cancer: seven years experience with a regional audit system. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)70549-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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75
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Nardin G, Lagoudakis KG, Wouters M, Richard M, Baas A, André R, Dang LS, Pietka B, Deveaud-Plédran B. Dynamics of long-range ordering in an exciton-polariton condensate. PHYSICAL REVIEW LETTERS 2009; 103:256402. [PMID: 20366268 DOI: 10.1103/physrevlett.103.256402] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Indexed: 05/29/2023]
Abstract
We report on time-resolved measurements of the first order spatial coherence in an exciton-polariton Bose-Einstein condensate. Long-range spatial coherence is found to set in right at the onset of stimulated scattering, on a picosecond time scale. The coherence reaches its maximum value after the population and decays slowly, staying up to a few hundred picoseconds. This behavior can be qualitatively reproduced, using a stochastic classical field model describing interaction between the polariton condensate and the exciton reservoir within a disordered potential.
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