function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Babaeian, Esmaeil & Saboori, Alireza & Gwiazdowicz, Dariusz J.', 3],
    ['Bolger, Thomas & Arroyo, Julio & Piotrowska, Katarzyna', 1],
    ['Ebrahimi, Najmeh & Noei, Javad', 1],
    ['Farahi, Sara & Shishehbor, Parviz & Nemati, Alireza', 1],
    ['Halliday, R. B.', 6],
    ['Kontschán, Jenő', 1],
    ['Kontschán, Jenő & Ermilov, Sergey G. & Friedrich, Stefan', 23],
    ['Pereira, Matheus Carvalho Soares De Aguiar & Kontschán, Jenő', 3],
    ['Saboori, Alireza & Shirvani, Zeinab', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=40)',
    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);