function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Besteiro, Celia & Ayora, Mario', 1],
    ['Bezerra, Tania Nara & Pape, Ellen & Hauquier, Freija', 6],
    ['Khudhir, Manda & Hodda, Mike & Nicholas, Evelyn', 16],
    ['Pérez-García, José Andrés & Ruiz-Abierno, Alexei', 1],
    ['Rho, H. S. & Kim, W. & Chang, C. Y.', 2],
    ['Shahina, F. & Nasira, K. & Firoza, K. & Erum, Y. I.', 1],
    ['Venekey, Virág & Fonseca-Genevois, Verônica G.', 1],
    ['Wen, Guo & Huixin, Liang & Mengna, Wang & Chunming, Wang', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    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);