function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Borges, Paulo A. V. & Gaspar, Clara', 4],
    ['Castro-Huertas, Valentina & Minghetti, Eugenia', 1],
    ['Gapon, D. A.', 7],
    ['Gapon, D. a.', 1],
    ['Ghahari, Hassan & Chérot, Frédéric', 5],
    ['Linnavuori, Rauno E.', 9],
    ['Matsunaga, Janis N. & Howarth, Francis G.', 1],
    ['Norbiato, Margherita & Dioli, Paride & Cianferoni, Fabio', 2],
    ['TASZAKOWSK, Artur & PASIŃSKA, Agnieszka', 3],
    ['Vinokurov, N. N. & Rudoi, V. V.', 1],
    ['Vinokurov, Nikolay N. & Rudoi, Valentin V.', 2],
    ['Yazici, Gülten & Yildirim, Erol', 4],
    ['Zamani, Mozhgan & Hosseini, Reza', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=41)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);