function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Borges, Paulo A. V. & Gaspar, Clara', 2],
    ['Dursun, Ahmet & Fent, Meral', 4],
    ['Ghahari, Hassan & Chérot, Frédéric', 4],
    ['Linnavuori, Rauno E.', 2],
    ['Norbiato, Margherita & Dioli, Paride & Cianferoni, Fabio', 4],
    ['Yazici, Gülten & Yildirim, Erol', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);