function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gkelis, Spyros & Ourailidis, Iordanis & Panou, Manthos', 14],
    ['Gupta, Pratibha', 1],
    ['Luz, Ruben & Cordeiro, Rita & Fonseca, Amelia', 18],
    ['Sant’Anna, Célia L. & Kaštovský, Jan & Hentschke, Guilherme S.', 6],
    ['Tihelka, Erik & Jäch, Manfred A. & Kundrata, Robin & Li, Yan-Da', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=42)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);