function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Angus, Robert B & Sadílek, David & Shaarawi, Fatma', 1],
    ['Darilmaz, Mustafa C. & İncekara, Ümit', 4],
    ['Fabricius, Johann Christian', 4],
    ['Fikáček, Martin & Kropáček, Daniel', 1],
    ['Herger, Peter & Germann, Christoph', 1],
    ['Litovkin, S. V. & Efimov, D. A.', 4],
    ['Prokin, A. A. & Sazhnev, A. S.', 1],
    ['Salah, Mohamed & Régil Cueto, Juan Antonio', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    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);