function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ballal, Chandish R. & Akbar, Shahid Ali & Yamada, Kazutaka', 1],
    ['Drake, Carl J. & Harris, H. M.', 1],
    ['Ghahari, Hassan & Carpintero, Diego Leonardo & Ostovan, Hadi', 4],
    ['Heiss, Ernst & Eckelt, Andreas & Lederwasch, Manfred', 7],
    ['Linnavuori, Rauno E.', 1],
    ['Moulet, Pierre', 4],
    ['Norbiato, Margherita & Dioli, Paride & Cianferoni, Fabio', 1],
    ['Yamada, Kazutaka & Yasunaga, Tomohide', 3],
    ['Çerçi, Barış & Koçak, Özgür & Tezcan, Serdar', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);