function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ghahari, H. & Jussila, R. & Šedivý, J.', 1],
    ['Heydari, Maryam Zardouei & Rakhshani, Ehsan', 1],
    ['Kolarov, J.', 1],
    ['Kolarov, J. & Bordera, S.', 1],
    ['M. F & Kirtay, H. & Birol, O.', 1],
    ['M. F & M. Y & Buncukçu, A.', 1],
    ['Riedel, Matthias & Diller, Erich & Japoshvili, George', 1],
    ['Schwarz, Martin & Holy, Kamil', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);